Paul, the problem was that I did not understand what was happening at the time. I was not sure if I was being dragged on the bottom or just sliding along a grade to deeper location. When I started to ascend, I had no sensation of motion in any direction. I was thinking that maybe my air solenoid to the VBT tank was not functioning or maybe I was taking on water that was making me heavy. If I had realized I was gliding horizontally, I could have just open up the throttle and used my aft control surfaces to drive to the surface. I would have had plenty of control to do this but I just did think of it as I thought I just doing a vertical ascent with my VBT with an anchored topside boat. At the time I was more worried about hitting the bottom of his boat with my viewport.
Cliff