I WONDER - What Bioluminescent Sea Creatures Exist In The Oceans?

The video explores the deep ocean, a place of constant darkness where sunlight doesn't reach beyond 200 meters. Despite this, it's not entirely dark due to bioluminescent marine creatures like anglerfish, lanternfish, and jellyfish. The anglerfish uses a bioluminescent lure on its head to attract prey, which it captures with its sharp teeth.

Explain why the deep ocean is not completely dark despite the lack of sunlight.

How does the anglerfish capture its prey?