Simplify the following text for a Grade 8 native English-speaking person.
Original: Elephant seals dive to 1550 m beneath the ocean 's surface ( the deepest recorded dive of an elephant seal is 2388 m by a southern elephant seal ) .
Simplified: Elephant seals dive to 1550 metres beneath the ocean 's surface : the deepest recorded dive of an Elephant seal is 2388 m .