A staggering 60 riders who surfed on the same board are set to have created a new record.
Surfers in California used a 12m (40ft) long board, which is 3m (10ft) wide and weighs in at 544kg.
The previous record of 47 surfers on one board was set earlier this year in Australia.
Friday's world record attempt in Huntington Beach was part of the US Open of Surfing and has to be verified by the Guinness Book of Records.
The surfers were a mixture of junior lifeguards, current professionals and former surfing greats.
At first 65 surfers were on board, but the combined weight of the board and people proved too much for the jet ski to tow it out, so five volunteers opted to get off.
After two close attempts, the board finally caught a wave as it neared the shore break and travelled under ocean power for nearly 12 seconds.