"They thought it was a scratch at first and sent him down below.
"When people are bitten by a snake they are usually sick but that didn't happen to Harry. He didn't show any signs of being ill."
Evans said her son went to have a shower and put some antiseptic on the bite but quickly started to lose consciousness.
"He never made a fuss or a big deal out of it," she said.
"Then his eyes rolled and he drifted in and out of consciousness for a while and fell asleep."
"They were four hours from land and there were other boats in the area and they rushed to help but there was very little that anyone could do".