Captain Obvious: When Billy arrives to inform Martin that the tooth he found indeed belongs to a sea monster, he notices that they probably knew that since they're currently in its stomach.
Fanservice: Martin can't help but hit on a bikini clad woman.
Greed: The reason why Stefan lied to the Agents about the treasure and why he was willing to let his friend Lance be devoured by the leviathan; he wanted to keep the treasure all to himself.
Humans Are Flawed: Martin doesn't blame Diana for not feeling completely okay at returning the treasure to the sea. It's not easy for a human to give up so much gold.
Kraken and Leviathan: Martin can't help but theorize that a giant squid is the guilty party, and the actual monster of the episode is a leviathan.
Playful Dolphin: Java encounters a friendly prehistoric dolphin-like creature that he knew back in the distant past. How is it still alive after all this time is unaddressed.
Sea Monster: The leviathan, which is big enough that its stomach has an immune system that can attack people.
Sensor Character: The leviathan is so attuned to its treasure, it knows when even one piece is missing. Diana compares it to an accountant as she returns the final coin to the sea.
Swallowed Whole: Diana, Martin and Java end up swallowed by the leviathan.
