aquaventurepersonal submarineseabirdPersonal submarine zips along at 40-mph, with strings attachedMichael TreiMonday, January 2, 2012 - 12:55am There have been plenty of personal submarines for the ultra rich, but most of them will only putter along at a few knots. The SeaBird manages to scream along at 40 mph, but there's a big catch.
