There's an interesting looking game on kickstarter, which I think not many people have heard of.
https://www.kickstarter.com/projects/1655728789/hms-marulken-reboot
So basically it's like Pulsar: Lost Colony or Guns of Icarus Online mixed with the Silent Hunter series. They're asking for only about 21k
https://www.kickstarter.com/projects/1655728789/hms-marulken-reboot
What is HMS Marulken?
HMS Marulken is a co-op simulation game in which a team of players operate a Swedish world war II submarine. The game is played over a local network or the internet on PC and Mac. The players connects to a server, where they choose a submarine to serve on. Each crew can consist of up to four players, manning the stations in order to operate the ship. The game (demo) is available here: http://hmsmarulken.se/.
So basically it's like Pulsar: Lost Colony or Guns of Icarus Online mixed with the Silent Hunter series. They're asking for only about 21k