The dive-centre with the 33m-deep pool has just added an intimate restaurant 5m below the surface. Called the Pearl, it’s a 2m-wide air-supplied white sphere with portholes.

Tethered in an upper level of the pool, it contains a table for up to four people.

Diners leave their dive-kit at the door as they swim up inside the air-pocket to take their seats.

A meal of foie gras, lobster salad and champagne is served from waterproof cases by scuba-diving waiters.

“We are launching a new era of restaurants,” said John Beernaerts, who opened the pool, at that time the world’s deepest, in the Belgian capital 12 years ago.

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