kwinter
Contributor
I would like a clarification of the original question. Is the OP asking about two boats that arrive at the same wreck site and using the same down line to get to the wreck? Maybe the phrase "into the wreck" was incorrect. Let's assume this has nothing to do with penetration. Plenty of wrecks are large enough for several dive boats to share simultaneously. But each boat would set up its own anchor or down line and tie in. Some large sites have multiple permanent moorings. Other times a second boat will ask permission for a mate to descend on the first boat's line in order to set their own line. But each boat should end up with its own tie in.
Now if the question really was about penetration, then it has nothing to do with the number of boats. It is the number of teams that matter, just like in a cave. You do not EVER enter an overhead environment on another team's line. If they leave first and pull their line, you've got nothing. Each team (and I would limit that to 4 people max) would run a line in. Being able to not only run the line, but also recognize and distinguish yours from other teams is a critical survival skill worth the price of a training course itself.
iPhone. iTypo. iApologize.
Now if the question really was about penetration, then it has nothing to do with the number of boats. It is the number of teams that matter, just like in a cave. You do not EVER enter an overhead environment on another team's line. If they leave first and pull their line, you've got nothing. Each team (and I would limit that to 4 people max) would run a line in. Being able to not only run the line, but also recognize and distinguish yours from other teams is a critical survival skill worth the price of a training course itself.
iPhone. iTypo. iApologize.