None.

A whale describes about fish and whales swallowing planktons.

A fish eats another fish.

References to boats sinking, prior to these boats being found. A still but drawn photo of Titanic sinking is seen.

A whale attempts to eat a smaller sea creature, only to get some ink in his mouth.

A small submarine driven by two boys and a dog bumps into something. Nothing serious happens.

None.

Pipe smoking.

Mild underwater peril. This Soviet cartoon is suitable for children.