we seem to be confusing cost with efficiency
If double crewing means the asset can be on patrol nearly double the time it might actually be efficient as it replaces purchasing and maintain two of " insert craft / vessel / item of choice "
I guess thats the reason the boomers operate this way - if the vessel can be turned around faster than crew rest or morale can be turned around, it makes financial sense to do double up and get it back to sea.
I will not interject on the issue of north sea as I have no experience, but I will say I mentioned this to Mrs Dagenham about having two wives, a younger fitter one to be trained up for when the older one is tired and it didn't go down to well. Apparently, my rating for single wife duties is on suspension......
