The Scenario is well intentioned but we can only learn or make decisions with specifics.
The scenario is much too vague so the answers will be vague and many so we can't really learn without a very narrow band of what are right or wrong.
Plus are you the diver or Divemaster/Cox / because if you're the diver and I am the COX/Divemaster my decision goes what ever you think. So who are we?
Let's have two realistic well-defined scenarios.
1.Where diving the Pilsidski 20 miles east of Bridlington.
When in a 6m RIB with VHF, SATNAV the full biz.
Twin 50hp Mariners 30knots full speed with our load of divers.
Plenty of Oxygen for two.
All divers have been down and have maximum decompression penalties.
No other boats in the area.
Sea state calm. Light winds.
RAF Leoconfield heliport, standby 15mins. 20 mins average contact time.
I hour to the pot.
Billy the techy wanabe surfaces with his unconscious buddy 30 mins deco to do.
Probable heart attack.  What do you do? You're the Divemaster the surfaced diver wants to go back down?
   





(Edited by Geoff Woodhead at 11:05 am on Nov. 1, 2002)