Deep sea life on Davidson sea mount - West US 1500m depth. The Davidson seamount is an impressive feature that has intrigued people since it was first charted as a 'sea mountain' in 1933. The seamount is located 120km southwest of Monterey, California, it is an inactive volcano 2,300m tall and 40km wide, yet its summit is 1,300m below the ocean surface. Davidson Seamount is geologically young but has remarkable biological communities, including large, dense patches of sponges and apparently extremely old coral forests, with individuals commonly reaching more than 3m in height. The seamount is also home to a wide variety of fish, eels, sponges, jellyfish, sea anemones, sea stars and brittle stars.