A young boy is briefly seen bare chested in very few scenes.

A female fish appears to be in love and flirting with the same boy.

A mermaid is partially nude, just with shells covering her breasts.

Several sharks attack and bite several whales.

An octopus attacks several characters. A boy makes a large amount of fish to bite and eat on the octopus.

A base is subjected to massive water flood, causing several people to die.

There is an underwater battle between underwater vehicles.

A young character is hit several times by the main villain. These scenes are mostly made in cartoonic style.

Characters fight each other.

A giant robot fights some mechanical creatures.

None.

Nothing very intense in terms of violence and the movie itself. Some viewer may find parts of the editing to be intensely bad, as spotted on old Korean prints in very poor condition.