The underwater housing that I have the pleasure of working with is the Sea&Sea DX-D80 with an accompanying NX-fisheye dome port. The flashes are operated via an external TTL-converter, which is developed by Sea&Sea especially for Nikon cameras. The TTL-converter is equipped with a built-in TTL PCB which communicates between the Nikon digital SLRs and the Sea&Sea flashes from the YS-series. The underwater housing is comfortable to handle. An ergonomic hand grip ensures that even small hands can operate the camera easily.
Digital Underwater Photography Sea & Sea DX-D80
Sea and Sea DX-D80 Underwater House for the Nikon D80 Digital SLR