lerpy
Contributor
In some of the drift diving I do we use negative entry. As has been stated through the posts this is not being over weighted, just going in with no air in the wing. We use it at times in the river as some of the sites are in the middle of the river and you need to get below the surface to get out of the way of boat traffic. As well if the boat is in the river and there is a ship coming the captains like to get the boat well out of the way of the ship and the divers down in a quick and efficient manner. This would not be used with divers that were not experience with doing this or were uncomfortable in the situation.