That's one large Alien Sub... Or a Thargoid. 

This is the singlemost terrifying frame of all of TFTD.... 

Literally the first time I see this screen 

Best alien species ever ^^ 

Alien troops droped weapons and surrender at the mercy of conquerors. 

The most grueling 47 turns I have ever experienced. 5, then 4 guys and gals against an entire cargo ship filled with aliens... 

Intro 

Cthulhu. Well thats not suprise for me. 

Depths of the sea conceal the menace. 

I don't understand what happened, multiple explosions caused this. xD　爆発の連鎖で海底がぐちゃぐちゃになってしまった。