More people have been to the Moon than to the Hadal Zone. The Hadal Zone: This is the ocean realm in the deep ocean trenches.The temperature here is near freezing and very few animals can survive the extreme pressure. The Abyssal Zone: This zone includes the deep ocean plains and the deep cusp of the continental rise.The Midnight Zone: This is the deep ocean, which is bounded by the continental slope and the seamounts and islands rising above the ocean floor.This zone is bounded by the edges of the continental shelf and islands in the deep ocean. There is enough light to see, but not enough for photosynthesis. The Twilight Zone: This is the medium-depth ocean where sunlight is still able to penetrate to a modest depth (a few hundred meters).Phytoplankton can photosynthesize in this zone. The Sunlight Zone: This is the shallow (upper 150 meters), sunlit upper layer of the ocean, extending above the continental shelf.The five vertical zones in the above diagram have the following general characteristics: This basic concept is shown in the following diagram. The oceans can be divided into vertical zones based on water depth. What is there to see on the way down to the bottom? Topography of the Challenger Deep and locations of the deep dive sites. 2019: Triton Submarine president, Patrick Lahey, in the DSV Limiting Factor, made two dives to the bottom, one in the Eastern Pool and one in the Central Pool. ![]()
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