Failure to have an AED can be a liability issue. (At least one gym had to settle a very large suit on account of not having an AED when a client died on site. Another gym has been sued multiple times and has settled most of the suits with payments.) ]
Sorry to pick a bone on this but just because there was a succsessful lawsuit doesn't make it right! In a first world country it is not unreasonable to have a defib in places where people exercise. The cause of death is usually primary arrhythmia due to ischaemia. This is exactly the situation where early difibrillation will be most effective. The person is on dry land and defib can occur within minutes, no huge oxygen debt. In drowning the cause of arrest is hypoxia, and in diving there is usually a significant delay before the victim is extracted with a huge oxygen debt. Good quality CPR with adequate oxygenation may be necesary before defib will be effective.
The cost is a not a 1 off in purchasing the equipment it is in the ongoing maintenance, checking, replacement. For something that is hopefully/probably going to be used once in 20 years or more on any given dive boat. How would it look if it was there but didn't work!! For every minute that defib is delayed mortality increases by 10%.
I think I agree with other posters the answer is in prevention.
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