I think it all depends on where you put them and how deep. If it's 10' or less and on a flat bottom you could probably just get them started down in good shape and turn 'em loose. Most everything I've sunk is in deeper water (18' to 25') and I lower them with a rope. For me there's too much time, effort and money involved not to make absolutely certain the condos are sitting like you want them. Happy sinking.
Mark