Cold Waters Nuclear Submarine game/sim website by PMC.
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See Killerfishgames Dev Posts in steam, you probably need to be logged into steam though. Sorry I didn't capture the source links for each of these below dev posts back in the day when I grabbed the text and right now, there is already "Warn on the Sea" posts etc so its very cumbersome to find the original links, but that main Killerfishgames post history will show you them, again sorry about that. There are some relevant developer posts missing, changelogs etc historical announcements, if you find those links please let me know.
"Patches can be released at any time. Things have been very busy as you might imagine and we've already prioritised a list of stuff to get fixed asap from all the feedback we've received so far."
Why are the crew messages not voiced? "They will be soon."
"Our intention is to keep WASD as the default navigation. However those wanting more sim-like command can pop open a navigation panel to set course, depth, masts, etc. Its use will be entirely optional."
2-3kts precise speed control? "Likely coming as part of the navigation overhaul."
"New features: Pause campaign strategic map (maybe speed toggle as well). Voices for message log. Towed array displayed in 3D, ability to extend and withdraw"
Cold Waters v1.01 beta is available! steamcommunity link.
"We just released a beta of version 1.01 to deal with initial bugs. The new navigation system will be coming in the next weeks."
Subsim.com zz_COLD_WATERS_UPDATE1.jpg link.
Subsim.com zz_COLD_WATERS_UPDATE2.jpg link.
Difficulty levels: "Hard is closest to reality we feel. In fact we plan to rename the difficulties to: Easy, Casual, Realistic, Elite"
"We don't plan to put Cold Waters on sale any time soon (if ever). Instead the plan is to keep making additions and improvements to the game."
Cold Waters v1.02 beta changelog: steamcommunity link.
"we plan to tweak the sensor model as right now the Soviets seem more capable than they probably should be."
steamcommunity image link. Nevermind its a dead link.
Cold Waters v1.03 beta changelog: steamcommunity link.
Cold Waters v1.03b beta changelog: steamcommunity link.
Cold Waters v1.04 beta (and 1.04b) changelog: steamcommunity link.
"We're going to significantly increase the campaign length in 1.05 as it seems to be what players want."
Cold Waters v1.05 beta changelog: steamcommunity link.
Cold Waters v1.05b beta changelog: steamcommunity link.
2020-04-03 Cold Waters development has ended steamcommunity link.
Unless I'm mistaken the v1.15g version is the latest game engine version.