My father sat between the Twin Hercules in the Beau and the Twin Merlins in the Mossie, he was a Radar Op/Nav. With just those thin leather flying caps, the noise was astounding he said. You could be up for 6 or 8 hours. His hearing was damaged beyond repair. He lost high frequency sounds first and landed up with two hearing aids. He did not complain about it. I have no idea what he thought about those sounds when he heard them in later years. He would be aproaching his 98th birthday.