Accessible only by liveaboard, Mexico's Revillagigedo Islands, otherwise known as Socorro, are associated with unusually close-up encounters with giant Pacific manta rays, wild bottlenose dolphins, whale sharks and humpback whales that arrive to breed and calve each year.

Up to seven species of shark also visit these waters, including schooling hammerheads, Galapagos and silky sharks.

So world-class liveaboard adventure is the promise from Dive Worldwide, which is offering a 10-night experience on the Nautilus Under Sea from £3795pp, including flights from the UK.

This is a set-date trip, departing on 7 April 2019 to coincide with prime humpback-whale season.

www.diveworldwide.com