What's the secret to such long dives? The recommendations to newbies is something like enter no more than 45 minutes before high tide and exit no more than 45 minutes after high tide. Being a relative newbie, I have found that to be good advice. The couple of times we attempted to push it, we had to fight the current with all our strength. I'm guessing that the savvy Troll knows just where to position herself at what time?