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Stonehenge and its Environs »
The bluestone debate
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Steve Gray
Steve Gray
931 posts

Re: The bluestone debate
Jun 21, 2006, 23:01
If I knew where to look I might be tempted to give it a go. How deep do you think we are talking? Dive time is very dependent on depth. The deeper you go the more air you use with each breath and the longer it takes to get down and back up again. Even with spare tanks you can't extend your bottom time by much without incurring lengthy decompression stops (which themselves require further air) and significantly extended intervals between dives. For example, the maximum recommended bottom time at 40m is only 9 minutes for normal recreational diving.

At around 10m a tank typically lasts me 40 minutes or so (I'm a heavy-breather), but at 20m that might be reduced to about 25 minutes. You can dive for longer with oxygen enriched air (Nitrox) and I'm planning to do the training for that this summer. Even so, you still can't cover a very big search area in any one dive and it's not cheap to hire the gear, so you need to have a pretty good idea where to start looking. Any suggestions?
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