Then he says he's kicking and kicking in a valiant effort to save her. It takes an average of 20 kicks to go 100 feet (well, my average during the Advanced Class), which is five feet per kick. Meaning, he only gave 2-to-3 kicks of effort to save her. So if he is really doing as much kicking as he says he is - he would have to travel more than just 10-14 feet. That's really what will sink his story, his computer will not show the dramatic dip he is talking about - and that is what the police is focusing on. . To me, that is not the dramatic kicking-down effort that Watson described.
From his testimony:
WATSON: ..cause if we were at forty something feet and I think my computer said fifty-four you know that was just a matter of ten foot or less going down..
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WATSON: I couldn't grab her hand because she was, you know, maybe five feet below me or something like that. I don't really know. I went down, started kicking down, and I was kicking down. But as fast as I was kicking down to go get her, she was going down just as fast..
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The only other argument Watson might try to make is that there was an upwelling current that he was fighting and that is why he was kicking so much, getting nowhere. But he never claimed that and if that was true - you can't explain why Tina was sinking instead of rising. Again - the dive instructor went down very quickly to retrieve Tina and brought her to the surface - so an extremely rare bottom-up current being the cause of his getting nowhere with all the kicking, just won't hold-up.