Play Submarines Attack

Drop the depth charges into the paths of the submarines to destroy them. The game gets much harder as it goes on, with more submarines firing at you. You won't die in one hit but your hull integrity will degrade as the subs score attacks. Try to put the charges further ahead of faster subs. Move your ship well before the subs' torpedoes hit you, because your ship is slow. You can only have three depth charges out at one time, so use them wisely. Don't use three to destroy one sub unless you're trying to ensure it gets hit. You'll find that it only takes one charge to kill a submarine.