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Scubatooth once bubbled...
at the recent DUI demo i tried a pair of extra force with wiskers (pointed straight out, not turned in) and when leading in my buddy group during a navagation run i just took off and about after a couple of minutes i did a roll to look for them and had to wait over a minute till they caught up with me (and i was just doing my standard kick, and i did not once stir the bottom and i was about less then a foot off the heavily silted bottom)
FWIW