The diving bubble settled onto the ocean floor, sinking slightly into the sand and sending up an obscuring cloud of silt. I turned the spot lights on and pointed them into the black depths, straining to see through the dust storm my landing had stirred up. The disturbed sand gradually settled, leaving me alone in the still, silent depths. I panned the lights until I saw what I was looking for, strange shapes sticking up out of the sand. I turned the key and the engine sputtered to life, filling the compartment with machine noise and the smell of diesel.