It is a canyon that is under the sea.
A canyon is a place where the ground has eroded into a deep ravine or gully - like the Grand Canyon. The sea is the same as the ocean.
Undersea canyons can vary in depth, with some reaching depths of over 3,000 feet or more. The depth of an undersea canyon depends on various factors such as the geology of the area, tectonic activity, and ocean currents.
Undersea volcanoes that erupt.
Undersea City was created in 1958.
Undersea Fleet was created in 1956.
Undersea Trilogy was created in 1992.
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.
Jules' Undersea Lodge was created in 1986.
Naval Undersea Museum was created in 1995.
Undersea Kingdom was created on 1936-05-30.