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The pelagic zone can be thought of in terms of an imaginary cylinder or water column that goes from the surface of the sea almost to the bottom. Conditions differ deeper in the water column; the pressure increases, the temperature drops and less light penetrates.he pelagic zone can be contrasted with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the very bottom of the sea.
1 Depth & Location The Ocean Pelagic Zone reaches down to a depth of 11 km (6.8 mi) at the lowest point and has an average (mean) depth of about 3.68 km (2.29 mi).2  The depth plays an important role: As depth increases, the abundance of life decreases. 9. 2  Temperature & Pressure The temperature in the Pelagic Zone varies greatly depending on the depth, with the Epipelagic Zone reaching up to 26Â°C and the Bathypelagic Zone falling to temperatures as low as 2Â°C. 3  Because of the depth and water, pressure increases by great amounts in each zone.