LiteHedded
Contributor
Why on earth would anyone go down a line in significant current? Unless we are on a drift dive, we dive at slack tide. The current is sometimes still running slightly on descent, but no one is hanging on the shot line like a flag in the wind on descent. Normally it's a thumb and middle finger forming an 'o' around the line, which is followed down to the wreck. If the wreck isn't permanently shotted (and most aren't, unless they're in a harbour or bay), once the last team hits the bottom, they send the shot line back up to be recovered by the boat crew. At the end of the dive, pop your blob and it's a green water ascent to the surface where the boat will recover you.
it guarantees you'll hit the wreck (assuming the line is on the wreck)