The "modular bcd" or buoyancy device being used in this video, is a specialist "cave diving" piece of equipment, requiring specialist training. Sidemount buoyancy devices for "Open Water" diving environment will require more lift capacity; see the current "commercial" products like the Hollis SMS 100 or Dive Rite Nomad... Steve Martin, This video shows diving with a single sidemounted cylinder and open water diving skills using sidemounted configuration. Dives made using the Steve Bogaerts designed razor sidemount harness. Location Ponderosa, Mexico - filmed by Jason from www.scubavideoservices.com, edited by Steve from www.sidemountscubadiving.com