Multiple people are impaled and drowned either with or without dying
People are shot with machine gun, we only see the gun spraying the room and then all the recently killed bodies laying there or slumping over.
Numerous people are stabbed or slashed. blood is shown in only one scene. Some die from their wounds.
Sea monsters bite and chomp other soldiers, some swallowed whole, others bit in half (not in a gory manner though)
A person is sacrificed to the creatures of the deep.
People are injured in explosions, one man's face is injured in an explosion, others are crushed by large rocks and falling debris.
A man almost drowns to death.
A man dies really brutally offscreen.
Near the beginning of movie, man gets stabbed with large sword in submarine. Quite confronting as it happens very quickly.
A woman eats a small live fish at the beginning of the movie.