Question

Which ocean depth is below 6000 meters and includes hydrothermal vents?

Answer 1

I’m pretty sure the Abyssal Zone.

Answer 2

The Abyssal Zone

The abyssal zone or abyssopelagic zone is a layer of the pelagic zone of the ocean. "Abyss" derives from the Greek word ἄβυσσος, meaning bottomless. At depths of 3,000 to 6,000 metres (9,800 to 19,700 ft), this zone remains in perpetual darkness.