A statement from Eastbourne College said its community was “deeply saddened” by his death. “Our thoughts are with his family at this incredibly sad time.”The college and CCF (Combined Cadet Force) flags will fly at half-mast at the beginning of next term.”His parents and sister have asked us to let the college community know and to advise that further details about arrangements will follow in due course.”Tributes were paid to Mr Byatt on his memorial Facebook page, describing him as a “beloved son, brother and friend”.A Foreign Office spokesman said: “We are supporting the family of a British man who died in Zakynthos, Greece and are in contact with the local authorities.” A 19-year-old British snorkelling instructor has died while swimming underwater off the Greek island of ZakynthosHarry Byatt, a former pupil at Eastbourne College, failed to surface after diving into the sea, his employers said.He had been as an instructor at the Peligoni Club, the BBC reported. Staff at the club raised the alarm five minutes after he started swimming using a monofin and a mask.CPR was administered on the rescue boat after Mr Buatt had been found unconscious, but doctors and paramedics were unable to resuscitate him. Harry Byatt, 19, died while snorkelling off ZakynthosCredit:Facebook Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.