its a large crack in the ground, usually in a "V" shape, where the tectonic plate have seperated, leaving a large gap in the ground
Undersea volcanoes that erupt.
The Trieste was that famous submarine. It is actually considered a bathyscaphe, but the term submarine could be applied. It dove to the deepest undersea point in the world, the Challenger Deep in the Mariana Trench, where the water depth is nearly 36,000 feet. A link is provided to the Wikipedia article on this revolutionary undersea vehicle.
Undersea Trilogy was created in 1992.
Undersea Fleet was created in 1956.
Undersea City was created in 1958.
Undersea Quest was created in 1954.
Undersea Trilogy has 501 pages.
The duration of Undersea Kingdom is 3.77 hours.
Some islands may be built by undersea volcanoes.
Naval Undersea Museum was created in 1995.
Jules' Undersea Lodge was created in 1986.
Undersea Kingdom was created on 1936-05-30.