There are several Artists, Projects, Bands, called Deep.
1.) Deep, Augsburg - Germany post-rock, drone, electronic
2.) Deep, Zypern house, minimal, techno
3.) Deep, Philadelphia - US psychedelic, sixties
4.)DEEP,Japan punk,visual-kei

1.) Deep is an ambient, drone, experimental Indie music duo, formed in Augsburg, Germany in 1993. Bandmembers since then are Stefan Vetter and Bernd Spring. Stefan played in german HC Punk legend Inferno and Bernd in Grindcore Combo Ulcerous Phlegm, before they formed Deep. Both playing Bass. In the early Deep days, they sound very distorted and moved to a lighter more melodic style with drum maschines, synths, toy-instruments and voice. In 2004 they throw away the additional stuff and playing just earthquaking feedbacks with their basses, amps and FX. Currently they redefine themselfs and merging the melodic ambient sound from former days, with the more harsh feedbacks.
Bernd Spring is also running the Dhyana Records label, which released a wide spectrum of experimental sounds with experimental packages. From 8-bit breakcore stuff over experimental, ambient drone sounds to singer-songwriter stuff.
http://www.myspace.com/drivedeepdownhill
http://www.dhyanarecords.com

2.) deep is a cypriot electronic music group that is made up of Asi and Atesh K.. Their releases are on regular beats records.
you can find more information from www.regularbeats.com, http://www.myspace.com/regularbeatsrecords.

3.) there is also another band called deep, from the 60s. they released what is possibly the first album to include the word "psychedelic" in the title of an album, when they recorded and released the album, "psychedelic moods" in 1966. it was recorded in philadelphia, in the early hours in the morning, in the dark. it is recommended to listen to it, the same way. the album has been released on the fallout label.

4.)DEEP is Japanese rock band . main man 鈴木晃二(Koji Suzuki) is former vocalist of EX-ANS. they released two album from Extasy Record and,another two album from Major label.