The boat, called Hurricane, was off the coast of Marsa Alam when it caught alight, according to reports in the national press.
Twenty-six other passengers, including 12 Brits, were rescued from the boat and are said to be "well". According to the Independent, tour operator Scuba Travel, which chartered the boat, confirmed on Monday (12 June) the three missing Brits had died.
Initial reports claim the fire, which happened at around 6.30am local time, was down to an electrical fault in the engine room.
