Use Join button to connnect dedicated test server:

(IP: 192.243.109.132 Port:23322)

Please write me, if it does not work.

Minimal submarine fight against your friends and colleagues.

No single player mode.

It is tested with 4 players so far.

left = A, Left
right = D, Right
down = S, Down
up = W,  Up
fire = Left mouse button
fire2 = Right mouse button

sonar = Space

Known issues:

If you host a game check out your firewall port-forwarding rules. 

ESET internet security / nod32 might blocks the communication of the .exe file at first. Check out the notifications and allow communication for the program.