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What is the name of the deep-ocean zone with no light at all?

  • The abyssal zone
  • The twilight zone
  • The neritic zone

The answer is The abyssal zone. Below 4,000 m.

Hadal zone

The hadal zone, also known as the hadopelagic zone, is the deepest region of the ocean, lying within oceanic trenches. The hadal zone ranges from around 6 to 11 km below sea level, and exists in long, narrow, topographic V-shaped depressions.

Wikipedia · Hadal zone

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