HOI4 Dev Diary - Mines and Minesweeping

  • Crusader Kings II Expansion Subscription

    Subscribe to the CK II Expansion and enjoy unlimited access to 13 major expansions and more!


  • Paradox Space Exploration Sale has arrived! Up to 75% off

    How's the space on your hard drive? Paradox wants to challenge your galaxy brain with a great selection of space exploration games - and they're all on sale for some very down-to-earth prices! The sale runs from May 4th until May 10th at 17:00 CEST / 08:00 PDT.


    May 4th - May 10th
  • Crusader Kings III Available Now!

    The realm rejoices as Paradox Interactive announces the launch of Crusader Kings III, the latest entry in the publisher’s grand strategy role-playing game franchise. Advisors may now jockey for positions of influence and adversaries should save their schemes for another day, because on this day Crusader Kings III can be purchased on Steam, the Paradox Store, and other major online retailers.


    Real Strategy Requires Cunning

podcat

Oberkommando HOI4
Super Moderator
12 Badges
Jul 23, 2007
12.712
34.921
  • Europa Universalis IV
  • Hearts of Iron III
  • Semper Fi
  • 500k Club
  • Europa Universalis III: Collection
  • Europa Universalis IV: Pre-order
  • Hearts of Iron II: Beta
  • Europa Universalis: Rome Collectors Edition
  • Mount & Blade: Warband
  • Paradox Order
  • Hearts of Iron IV Sign-up
  • Hearts of Iron IV: Together for Victory
Welcome to another glorious Wednesday! Today we are going to be talking about mines and mine sweeping. Historically hundreds of thousands of mines were laid during WW2 and with Man the Guns you too will be able to do so in Hearts of Iron.

From a gameplay perspective mines do a lot of interesting things. They add more interaction with the naval layer of the game, create a weapon both for smaller naval nations to fight bigger ones, and for big ones to try and limit where the enemy can get to them.

Screenshot_1.jpg


As you may remember from my presentation at PDXCON, I talked about adding a ship designer to Man the Guns. It is not quite ready to show off, but it’s important to know that sweeping and laying mines are something you will be upgrading or redesigning your ships to be doing. Minelayers and Minesweepers are not actually new ship classes. In my screenies I have destroyers that can both lay and sweep mines for simplicity, but as @Archangel85 pointed out earlier “I am probably going to have a ton of different destroyer designs”... anyways, details on the designer is for a future diary when it is done, but hopefully it helps explain some stuff in the proper context.

Mines are unlocked from techs and require ship designs fitted to deploy them. Destroyers and light cruisers can do this, as well as submarines with the correct tech (excellent if you as Germany want to make things even more dangerous for the British at a lower risk to yourself). Mines can also be dropped from the air with later game techs. Both of these unlock new missions for navies and airwings.
mine_techs.jpg


Mines can be made better and better through research. You start off with Contact Mines to unlock them. Then their destructive power is improved with Magnetic and Acoustic mine techs and finally with Pressure mines. At the bottom (heh) you also see two techs for submarine mine laying. The first is just the basic ability, while the second improves efficiency a lot by allowing mines to be deployed through torpedo tubes, thus no longer requiring you to design specialized minelaying submarines.

To get rid of mines you need minesweeper capable ships. This unlocks the naval mission to sweep mines and will slowly work at clearing areas. Minesweepers are also nice to include in your fleets as they will then be assumed to travel ahead of the fleet and reduce the impact of mines on them. I suspect a good design combo will be anti-air and sweeper on screen ships to be your passive defense when in enemy waters.
mine_report_map.jpg


There is also a passive “degaussing” technology that can be researched after Magnetic Mines. This was employed during WW2 to reduce the magnetic signature of ships and thus make them less likely to set off mines.

It is also possible to sweep mines from the air, but this is a late game, expensive technology and unlocks a new air mission for bombers. This was something that was done sparingly and in shallow waters, but for example was successfully done to evacuate the Dutch royal family to Britain.

What do mines exactly do then? Well they blow stuff up! Their explosive results are shown on map as accident reports, and there is a new tab too under the Naval Losses statistics interface if you want to dig into details. As ships operate or move through a zone they will risk running into mines. This can lead both to minor damage as well as outright sinkings. The best ways to avoid this is to make sure the area is swept free of mines, but as mentioned above, having your ships travel with sweeping capable ships makes it safer for all.

mines report.jpg

This is not all through, mines have several passive effects.

Naval superiority - Having mines in an area helps amplify the effects of your navy (after all they can concentrate more effectively knowing where the mine fields are). This can be seen in our new naval area screen, which is the naval equivalent of the state view:
travel.jpg


Other than that and blowing ships up mines will slow down enemy ships (since they need to be more careful) and increases the invasion penalty to coastal area. So mines are both good offensively and defensively.

rep2.jpg


Mines can only be laid while at war and will start to disappear over time once a nation is completely at peace. You always know how much mines there are in an area, so you know how to deal with them and take them into account. That means that with the new naval access controls you can tell your ships and convoys to avoid heavily mined areas, but of course this may make it a lot more predictable for your enemies where to hunt. Having an advantage in the encryption-decryption war will also add a certain amount of passive defense against mine effects as you may have some information about their positioning.

See you all next week for more Man the Guns info!

Rejected Titles (for extra good reason this time...):
- This War of Mine
- Vengeance is Mine sayeth the Lord Admiral
- Do you mine’d
- This feature was made in cooperation with the seagulls from Finding Nemo
- Mine = blown
- The Ship Designer isn’t unfinished, it’s just a bit shy
- Minesweeper 2000 Online HD Edition
- Mine over Matter
- Mine the guns
 
Last edited:

CyberianK

General
63 Badges
Jan 17, 2014
1.824
1.151
  • Crusader Kings II: Charlemagne
  • Stellaris - Path to Destruction bundle
  • Victoria 2: Heart of Darkness
  • Victoria 2: A House Divided
  • Semper Fi
  • Victoria: Revolutions
  • Europa Universalis IV: Res Publica
  • Hearts of Iron III Collection
  • Hearts of Iron III: Their Finest Hour
  • Hearts of Iron III
  • For the Motherland
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Art of War
  • Crusader Kings II: Legacy of Rome
  • Crusader Kings II: The Old Gods
  • Europa Universalis IV: Conquest of Paradise
  • Crusader Kings II: Rajas of India
  • Crusader Kings II: The Republic
  • Crusader Kings II: Sons of Abraham
  • Crusader Kings II: Sunset Invasion
  • Crusader Kings II: Sword of Islam
  • Darkest Hour
  • Crusader Kings II
  • Stellaris: Leviathans Story Pack
  • Hearts of Iron IV: Together for Victory
  • Crusader Kings III
  • Steel Division: Normandy 44
  • Europa Universalis IV: Mandate of Heaven
  • BATTLETECH
  • Hearts of Iron IV: Death or Dishonor
  • Age of Wonders III
  • Europa Universalis IV: Cradle of Civilization
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Humanoids Species Pack
  • Stellaris: Apocalypse
  • Europa Universalis IV: Rule Britannia
  • Stellaris: Digital Anniversary Edition
  • Europa Universalis IV: Rights of Man
  • Hearts of Iron IV: Cadet
  • Hearts of Iron IV Sign-up
  • Stellaris
  • Europa Universalis IV: Mare Nostrum
  • Europa Universalis IV: Cossacks
  • Crusader Kings II: Horse Lords
  • Europa Universalis IV: Common Sense
  • Pillars of Eternity
  • Crusader Kings II: Way of Life
  • Europa Universalis IV: El Dorado
  • Cities: Skylines
  • Victoria 2
This sounds great.

Add actual "Sea Mine equipment" to have to be produced with MilFacs later and the system is perfect.
 

Real Strategist

Sergeant
40 Badges
Mar 8, 2013
78
38
  • Hearts of Iron III
  • Hearts of Iron III: Their Finest Hour
  • Hearts of Iron IV: Together for Victory
  • Crusader Kings II: Monks and Mystics
  • Hearts of Iron IV: Death or Dishonor
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Humanoids Species Pack
  • Stellaris: Apocalypse
  • Cities: Skylines - Parklife Pre-Order
  • Cities: Skylines - Parklife
  • Stellaris: Distant Stars
  • Prison Architect
  • Stellaris: Ancient Relics
  • Stellaris: Lithoids
  • Hearts of Iron IV: La Resistance
  • Stellaris: Federations
  • Crusader Kings III
  • Battle for Bosporus
  • Stellaris: Necroids
  • Stellaris: Digital Anniversary Edition
  • Hearts of Iron IV: Cadet
  • Hearts of Iron IV Sign-up
  • Stellaris
  • Magicka 2
  • Cities: Skylines
  • Stellaris: Leviathans Story Pack
  • Semper Fi
  • Arsenal of Democracy
  • Crusader Kings II
  • Crusader Kings II: Legacy of Rome
  • Crusader Kings II: The Republic
  • Crusader Kings II: Sunset Invasion
  • Crusader Kings II: Sword of Islam
  • Dungeonland
  • For the Motherland
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Megacorp
  • Stellaris: Synthetic Dawn
  • Stellaris - Path to Destruction bundle
  • Ancient Space
Nice idea for Germany and the British. :)

I hope you don't forget to rebalance torpedos. They don't do much damage atm and screens are useless against battleship (only) fleets.
 
Last edited:

Torma25

First Lieutenant
24 Badges
Oct 30, 2017
217
0
  • Europa Universalis IV
  • Crusader Kings II
  • Crusader Kings II: The Republic
  • Hearts of Iron IV: Cadet
  • Hearts of Iron IV: La Resistance
  • Hearts of Iron IV: Expansion Pass
  • Imperator: Rome
  • Europa Universalis IV: Dharma
  • Cities: Skylines - Parklife
  • Cities: Skylines - Parklife Pre-Order
  • Hearts of Iron IV: Expansion Pass
  • Hearts of Iron IV: Death or Dishonor
  • Hearts of Iron IV: Together for Victory
  • Europa Universalis IV: Rights of Man
  • Crusader Kings II: Reapers Due
  • Stellaris
  • Europa Universalis IV: Common Sense
  • Cities: Skylines
  • Victoria 2: Heart of Darkness
  • Victoria 2
  • Crusader Kings II: Sword of Islam
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Art of War
  • Crusader Kings II: The Old Gods
I think you should be able to clear mines in a seazone by voluntarily playing (and winning) a game of minesweeper. It would really add to the immersion.
 

Denkt

Left the forums permamently
42 Badges
May 28, 2010
15.763
6.359
Most of the swedish ships, including the Tre Kronor class light cruiser did carry mines so it is nice that you have manage to represent that.

Anyway with all these new technologies, will you rebalance the research cost a bit so not a navy take up too much research and leaving little to non resources left to develop anything else?
 

James Hale

Colonel
On Probation
Aug 2, 2018
858
6
Great dev diary, and I am glad that mines are being represented in a somewhat abstract manner, and that minesweepers are not a new ship class; (likewise, I think night fighters are better represented this way as well, rather than a separate new aircraft tech).

MtG is shaping up really well so far @podcat - good work on these diaries, and please add some more starting admirals for the major powers. :)
 

podcat

Oberkommando HOI4
Super Moderator
12 Badges
Jul 23, 2007
12.712
34.921
  • Europa Universalis IV
  • Hearts of Iron III
  • Semper Fi
  • 500k Club
  • Europa Universalis III: Collection
  • Europa Universalis IV: Pre-order
  • Hearts of Iron II: Beta
  • Europa Universalis: Rome Collectors Edition
  • Mount & Blade: Warband
  • Paradox Order
  • Hearts of Iron IV Sign-up
  • Hearts of Iron IV: Together for Victory
Anyway with all these new technologies, will you rebalance the research cost a bit so not a navy take up too much research and leaving little to non resources left to develop anything else?

yea. there is gonna be some tweaks. we have also done other changes to research we will be showing in the future
 

pommiebastard

Witchfinder Pursuivant
61 Badges
Aug 26, 2009
193
426
  • Arsenal of Democracy
  • Sword of the Stars
  • Rome Gold
  • Iron Cross
  • Heir to the Throne
  • Europa Universalis III Complete
  • Darkest Hour
  • Crusader Kings II
  • Europa Universalis IV: Mandate of Heaven
  • Europa Universalis IV: Golden Century
  • Stellaris: Megacorp
  • BATTLETECH
  • Hearts of Iron IV: Death or Dishonor
  • Hearts of Iron IV: Expansion Pass
  • BATTLETECH: Flashpoint
  • Shadowrun: Hong Kong
  • Age of Wonders III
  • Europa Universalis IV: Cradle of Civilization
  • BATTLETECH: Heavy Metal
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Humanoids Species Pack
  • Stellaris: Apocalypse
  • Europa Universalis IV: Rule Britannia
  • BATTLETECH - Digital Deluxe Edition
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Distant Stars
  • Europa Universalis IV: Dharma
  • Shadowrun Returns
  • Shadowrun: Dragonfall
  • 500k Club
  • Europa Universalis 4: Emperor
  • Hearts of Iron IV: La Resistance
  • Stellaris: Ancient Relics
  • Imperator: Rome Sign Up
  • Europa Universalis III Complete
  • Europa Universalis III Complete
  • Stellaris: Digital Anniversary Edition
  • Europa Universalis IV: El Dorado
  • Europa Universalis IV: Common Sense
  • Europa Universalis IV: Cossacks
  • Europa Universalis IV: Mare Nostrum
  • Stellaris
  • Hearts of Iron IV Sign-up
  • Stellaris Sign-up
  • Hearts of Iron IV: Cadet
  • Europa Universalis IV: Rights of Man
  • Europa Universalis IV: Res Publica
  • Europa Universalis IV: Conquest of Paradise
  • Crusader Kings II: Sons of Abraham
Rejected Titles (for extra good reason this time...):
- This War of Mine
- Vengeance is Mine sayeth the Lord Admiral
- Do you mine’d
- This feature was made in cooperation with the seagulls from Finding Nemo
- Mine = blown
- The Ship Designer isn’t unfinished, it’s just a bit shy
- Minesweeper 2000 Online HD Edition
- Mine over Matter
- Mine the guns

What, no?
- "Mine, all mine!!!"
- Please mine the gap
- Mine-boggling
- Manic miner
- It's all in the mine

etc etc etc
 

Fulmen

The local Finn
69 Badges
Dec 23, 2006
5.440
2.991
steamcommunity.com
  • Europa Universalis IV: Common Sense
  • Europa Universalis: Rome
  • Rome Gold
  • Victoria 2
  • Rome: Vae Victis
  • War of the Roses
  • War of the Vikings
  • 500k Club
  • Europa Universalis IV: El Dorado
  • Europa Universalis IV: Pre-order
  • Mount & Blade: Warband
  • Mount & Blade: With Fire and Sword
  • Crusader Kings II: Way of Life
  • Europa Universalis IV: Res Publica
  • Crusader Kings II: Horse Lords
  • Europa Universalis IV: Cossacks
  • Crusader Kings II: Conclave
  • Europa Universalis IV: Mare Nostrum
  • Stellaris
  • Stellaris: Galaxy Edition
  • Stellaris: Galaxy Edition
  • Hearts of Iron IV Sign-up
  • Hearts of Iron IV: Cadet
  • Hearts of Iron IV: Colonel
  • Hearts of Iron IV: Field Marshal
  • Stellaris: Necroids
  • Europa Universalis III Complete
  • Crusader Kings II
  • Crusader Kings II: Charlemagne
  • Crusader Kings II: Legacy of Rome
  • Crusader Kings II: The Old Gods
  • Crusader Kings II: Rajas of India
  • Crusader Kings II: The Republic
  • Crusader Kings II: Sons of Abraham
  • Crusader Kings II: Sunset Invasion
  • Crusader Kings II: Sword of Islam
  • Darkest Hour
  • Europa Universalis III
  • Europa Universalis III: Chronicles
  • Arsenal of Democracy
  • Divine Wind
  • Europa Universalis IV
  • Europa Universalis IV: Art of War
  • Europa Universalis IV: Conquest of Paradise
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Call to arms event
  • Hearts of Iron III
  • Heir to the Throne
  • Europa Universalis III Complete
  • March of the Eagles

pdstanbridge

Lt. General
37 Badges
May 1, 2010
1.374
223
  • Europa Universalis IV: Third Rome
  • Europa Universalis IV: Rule Britannia
  • Europa Universalis IV: Rights of Man
  • Hearts of Iron IV: Expansion Pass
  • Steel Division: Normandy 44
  • Europa Universalis IV: Mandate of Heaven
  • Steel Division: Normandy 44 Deluxe Edition
  • Hearts of Iron IV: Death or Dishonor
  • Europa Universalis IV: Cradle of Civilization
  • Hearts of Iron IV: Colonel
  • Hearts of Iron IV: Expansion Pass
  • Europa Universalis IV: Dharma
  • Europa Universalis IV: Golden Century
  • Hearts of Iron IV: Expansion Pass
  • Hearts of Iron IV: La Resistance
  • Crusader Kings III
  • Battle for Bosporus
  • Europa Universalis 4: Emperor
  • Hearts of Iron IV: Cadet
  • Europa Universalis IV
  • 500k Club
  • Europa Universalis IV: El Dorado
  • Europa Universalis IV: Pre-order
  • Europa Universalis IV: Common Sense
  • Europa Universalis IV: Cossacks
  • Europa Universalis IV: Mare Nostrum
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Call to arms event
  • For the Motherland
  • Hearts of Iron III
  • Hearts of Iron III: Their Finest Hour
  • Europa Universalis IV: Res Publica
  • Semper Fi
  • Europa Universalis IV: Art of War
  • Hearts of Iron IV: Expansion Pass
  • Europa Universalis IV: Conquest of Paradise
  • Crusader Kings II
What happens between wars, in the case when Axis is destroyed and the SU declares against the Allies. Usually this happens pretty quick, and mines were an issue for countries for many years after the war. Having them just disappear seems wrong.
 

Lithrus

Sergeant
60 Badges
Aug 15, 2014
85
0
  • Europa Universalis IV: Res Publica
  • Stellaris
  • Cities: Skylines - Snowfall
  • Europa Universalis IV: Cossacks
  • Cities: Skylines - After Dark
  • Victoria 2: Heart of Darkness
  • Victoria 2: A House Divided
  • Europa Universalis IV: Third Rome
  • Hearts of Iron III
  • Europa Universalis IV: Call to arms event
  • Europa Universalis IV: Wealth of Nations
  • Europa Universalis IV: Conquest of Paradise
  • Crusader Kings II
  • Crusader Kings II: The Old Gods
  • Europa Universalis IV: Art of War
  • Stellaris - Path to Destruction bundle
  • Hearts of Iron IV: Cadet
  • Crusader Kings II: Reapers Due
  • Europa Universalis IV: Rule Britannia
  • Europa Universalis IV: Rights of Man
  • Cities: Skylines - Natural Disasters
  • Hearts of Iron IV: Together for Victory
  • Crusader Kings II: Monks and Mystics
  • Cities: Skylines - Mass Transit
  • Europa Universalis IV: Mandate of Heaven
  • Stellaris: Apocalypse
  • Hearts of Iron IV: Expansion Pass
  • Cities: Skylines - Parklife
  • Cities: Skylines - Parklife Pre-Order
  • Europa Universalis IV: Dharma
  • Cities: Skylines - Green Cities
  • Hearts of Iron IV: Death or Dishonor
  • Victoria 2
  • Europa Universalis IV: Golden Century
  • Crusader Kings II: Holy Fury
  • Stellaris: Ancient Relics
  • Stellaris: Megacorp
  • Prison Architect
  • Hearts of Iron IV: Expansion Pass
  • War of the Roses
  • Cities: Skylines
  • Europa Universalis IV: El Dorado
  • Mount & Blade: Warband
  • Crusader Kings II: Way of Life
  • Europa Universalis IV: Common Sense
  • Crusader Kings II: Horse Lords
  • Crusader Kings II: Conclave
  • Crusader Kings II: Sons of Abraham
  • Crusader Kings II: Rajas of India
Will we be seeing land mines in the future? They were also an important part of the war.
 

RSalins

Second Lieutenant
31 Badges
Nov 5, 2005
155
70
  • Stellaris Sign-up
  • Hearts of Iron IV: La Resistance
  • Cities: Skylines - Campus
  • Hearts of Iron IV: Expansion Pass
  • Stellaris: Distant Stars
  • Hearts of Iron IV: Expansion Pass
  • Cities: Skylines - Parklife
  • Cities: Skylines - Parklife Pre-Order
  • Stellaris: Apocalypse
  • Stellaris: Humanoids Species Pack
  • Hearts of Iron IV: Expansion Pass
  • Hearts of Iron IV: Death or Dishonor
  • Cities: Skylines - Mass Transit
  • Stellaris - Path to Destruction bundle
  • Hearts of Iron IV: Expansion Pass
  • Hearts of Iron IV: Cadet
  • Arsenal of Democracy
  • Hearts of Iron IV Sign-up
  • Stellaris
  • Cities: Skylines - Snowfall
  • Cities: Skylines - After Dark
  • Cities: Skylines
  • 500k Club
  • Victoria 2: Heart of Darkness
  • Victoria 2: A House Divided
  • Victoria 2
  • Supreme Ruler: Cold War
  • Semper Fi
  • Hearts of Iron III: Their Finest Hour
  • Hearts of Iron III
  • Darkest Hour
When a sea area is swept by a mine sweeper well all the mines disappear or is a percentage based on the tech level you have.

Also a question. Well the number of mines laid and it’s destructive power depend on the size of the sea area? I guess I’m wondering how that well work.
 

James Hale

Colonel
On Probation
Aug 2, 2018
858
6