I know on my Crawlers, the motors have been submerged for minutes at a time repeated and ran fine as long as they were oiled routinely and cleaned if using in muddy water. Shoot I have submerged the battery and the motors and they ran fine. Electric motors are a lot of the time broken in underwater. Never ran them for extended periods of time underwater but I know they won't fail immediately and they would prolly be fine. The motors I am running are 55t Integy lath motors.