Years ago in Saudi Arabia I used to dive with an Aussie Padi Dive Instructor who had his own Rib, we went out to the Farisan banks most weekends. We had a ball exploring these places only about 4 of us it was dive heaven. One day we were approached by a Bsac dive club to take them out with us. So we took them out and the BSAC guys took control, they had a very formal way of recording there dives and surface intervals. We were more no deeper than 30m on the first dive, an hour and a half plus between dives, no deco dives and long 5m safety stops kinda guys. Very conservative diving as the nearest chamber which might work was in Jedda 6 hours away. Well Paul took exception to the BSAC dive officer recording our every dive in minute details. We dived with redundent computers. So out of badness Paul attached his spare computer to a fishing line and lowered it down to 75m, Then we went diving ( a 15m bimble round a very pretty Reef). After about 50 mins we retrived the dive computer which was an Alladin and was screaming at us about impending death. Surfaced climbed aboard the boat, where we were pounced upon by the Dive Leader for our dive time depth and surface code, Paul throws the Dive computer at him and says " thats what we dived mate". Well the guy went white and started spluttering about putting us on O2 and our impending death. We started laughing and confessed what we had done. At the time I found it funny. I feel really guilty about giving the poor guy such a scare. I now dive a lot with BSAC guys in the UK.