Mr. Raine, first off, I'd like to offer that rjack dives a LOT. In fact, he sometimes dives with me.
Second, I'll just talk about my experiences here. Yes, I put more gas in my wing to go down to 100 feet than to 20. But if I'm wandering around the Edmonds Underwater Park at 20 to 30 feet, going up to look at the tops of the structures and then back down to look at the bottoms, I'm going to end up venting my dry suit and then putting air back in it a lot of times. Whether that ends up being more than the total amount I put in the wing at depth, I don't know.
But I can't come up with any OTHER explanation for why somebody would have higher gas consumption in shallow water.
Second, I'll just talk about my experiences here. Yes, I put more gas in my wing to go down to 100 feet than to 20. But if I'm wandering around the Edmonds Underwater Park at 20 to 30 feet, going up to look at the tops of the structures and then back down to look at the bottoms, I'm going to end up venting my dry suit and then putting air back in it a lot of times. Whether that ends up being more than the total amount I put in the wing at depth, I don't know.
But I can't come up with any OTHER explanation for why somebody would have higher gas consumption in shallow water.