Answer:
Abyssal or Abyssopelagic zone or layer
Step-by-step explanation:
An ocean is a large body of water usually without limits. Based on the depth, an ocean is classified into parts or zones. The deeper the parts of the ocean, the lower the light penetration and temperature but the higher the pressure. The parts in accordance with their depths in metres (m) are:
- Epipelagic zone: This is the part of the ocean, also called sunlight zone, extending from the ocean surface to about 200metres.
- Mesopelagic zone: This zone, also called twilight zone, extends from about 200-1000 metres.
- Bathypelagic zone: This is the zone that extends from about 1000-4000 metres.
- Abyssopelagic zone: This zone, also called Abyssal zone, is that which extends from 4000-6000 metres.
THEREFORE, the exploration of the ocean at a depth of about 5,200 m means we are exploring the ABYSSOPELAGIC OR ABYSSAL ZONE because 5200m is within the range of 4000-6000.