Digital Jokers has just released a submarine sinking game called Submarine Crusher for FREE. Ok, they have a paid version but there's also a FREE version so you can taste the game before getting the gold version which has more missions and stuff.
In Submarine crusher, your objective is to...well...crush submarines by deploying bombs and barrels. You can also deploy "flares" to protect your ship from missiles that are fired from the submarine. The paid version of this game costs $1.05 and you can try out the FREE version below from the Android Market to get a taste of what it feels like to crush a submarine:
Submarine Crusher (FREE) - Android Market