1. Marine Biotopes of hyperthermophiles are various hydrothermal systems, located at shallow and abyssal depth, and at active seamounts, e.g

2. The United States also operates a new vehicle designed for science missions at abyssal depth, the “Odyssey II”, intended for survey operations

3. The United States also operates a new vehicle designed for science missions at abyssal depth, the “Odyssey II”, intended for survey operations.

4. Abyssal plain, flat seafloor area at an Abyssal depth (3,000 to 6,000 m [10,000 to 20,000 feet]), generally adjacent to a continent