This question has been posted before. The current thread on deep air
vs helium has insprired me to repeat it. For those who want to see
the original thread, here is the link --
http://x67.deja.com/[ST_rn=ps]/viewthread.xp?AN=620275929&search=thread&svcclass=dnyr&ST=PS&CONTEXT=978137269.924319781&HIT_CONTEXT=978137269.924319781&HIT_NUM=3&recnum=%3c8f3sb3$vp2$1@newsmaster.pathcom.com%3e%231/1&group=rec.scuba&frpage=viewthread.xp&back=clarinet

Hope it survives the line wrap - If not, do a Power Search with the
keyword hypothetical, me as the author, and here as the forum. Comes
right up.

Here is the original post.


Scenario

You are a GUE trained tech diver, believe that what they teach is the
best way, and own any gear necessary for any type of diving you may
do.

You win a free trip on a liveaboard in Belize. You check things out
and learn that:
1. The normal routine is 5 dives per day, 2 in the morning, 2 in the
afternoon, and one at night.
2. The boat has air and Nitrox, but not helium.
3. The boat has lots of Al 80 tanks, some dedicated to Nitrox and
some to air. All tanks have K valves with yoke fittings.
4. Most dives are wall dives. You can choose any maximum depth from
20 => 200 ft, but the boat has a guideline of no planned deco, and max
depth of 130 ft.
5. An exception is one dive at the Blue Hole. The interesting part
of this dive is at ~130 ft. Because of the depth, there is no late
morning dive that day. A trip to Bird Droppings Island for a BBQ
picnic lunch is planned instead.
6. You have the boat's permission to bring your own hardware (valves,
etc)

Questions

1. How many dives per day do you plan to make?
2. Do you use tables or a computer?
3. Do you go with the K valve, or do you make modifications? If so,
elaborate.
4. Do you dive the Blue Hole?
5. Do you make any equipment changes for this particular dive? If
so, elaborate.




Dan Bracuk
Toronto, Canada
Always use proper English, irregardless of what others do.