If you want to find out what lies beneath there can be few better ways of doing it than jumping inside this amazing new $5.5million (£4.1million) submersible.

It has just been delivered by marine engineering firm Triton Submarines, which describes it as ‘a salon under the sea’. It features the world’s largest transparent, spherical passenger compartment, giving those inside a spectacularly immersive underwater view.

The sub, called the Triton 3300-6, seats six people in comfort while the ‘Tiffany blue exterior’, selected by its owner, ‘appears to disappear’ once placed in the water….