 If you liked
Kenran Butou Sai: The Mars Daybreak
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 ...then you might like
Suisei no Gargantia
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Both Suisei and Mars Daybreak are sci-fi that deal with a planet covered in water and humanity living on ships-the only difference being in Mars Daybreak they have underwater cities. Both protagonists pilot mecha and in both mysteries of the past are uncovered under the ocean. Mars Daybreak and Suisei have a light-hearted comedic side and a darker one with more serious moments, though Suisei's is a bit darker.
If you enjoyed the comedy and interaction of the characters, and even the battles in Mars Daybreak, you'll probably enjoy the same with Suise no Gargantia.
Kenran Butou Sai: The Mars Daybreak and Suisei no Gargantia both have a unique blend of industrial and nautical elements in their respective settings which give off similar vibes. If you wanted to see more of that type of setting after watching one, I would suggest checking out the other, as it does a good job to scratch that itch.