His daughter, Nakita Colville, 27, who witnessed the ordeal in July, claimed the "unbothered and clueless" staff on board "just stood there watching". She said the barman declared him dead before staff covered his body and face with a towel.
The coastguard arrived and Peter was taken to hospital where he was confirmed to have died. And while the family - including two of his grandchildren - were taken off the boat, the party continued, with crew hosting a foam party for the remaining traumatised passengers, Nakita claims.
Nakita, an admin assistant, from Woking, Surrey, said: "When my brother-in-law came back out the sea after swimming, he turned around when he realised my dad was no longer behind him. Then we heard people yelling for help and saw my dad in the water, face up, with people trying to get him out.
"One of the other guests began giving CPR while the crew members just stood there with their arms crossed. Other guests were screaming and crying, my family was hysterical. We were living the worst moments of our lives but as soon as we were taken off, the crew just apologised to guests because the foam party was delayed, I've been told.
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One Tripadvisor review from the day read: "He was laid on the deck – and then nothing. No proper procedures, no clearing the deck from onlookers, no immediate CPR. A crew member looked into his eyes and declared him dead."
Another said: "After the life guard come to take the guy away we were simply told the emergency was over and they continued to play loud music and try to sell more photos."
A third added: "The way it was handled by the crew was nothing short of horrifying. It is unsafe, unprofessional, and the crew is neither trained nor emotionally capable of handling emergencies - or tragedies. A man died. And they carried on like it meant nothing."