Nautilus

Nautilus was launched in 2014 as Grace E, built at Perini Navi's Picchiotti yard with an exterior by Philippe Briand and Vitruvius and an interior by the French designer Rémi Tessier. New owners renamed her in 2019, and she had a refit in 2018. Her reputation rests on two things that rarely come together on a yacht of this size: a hybrid diesel-electric plant and a deck devoted almost entirely to looking after the body.

The engineering shapes the experience more than you might expect. She is unusually quiet both underway and at anchor, and dynamic positioning lets the captain hold station over seagrass or coral instead of dropping a chain on it. Systems that treat exhaust fumes and store waste on board for long periods mean she can linger in protected places without leaving much behind.

Wellness here is not a massage table squeezed into a spare cabin. Heat comes in two forms, dry and steam, alongside a hydrotherapy tub and rooms for treatments and beauty, and anyone who wants to swim before breakfast can do laps against the current in a compact pool at the back of the main deck. Up on the sun deck, loungers turn to follow the sun next to the Jacuzzi. Tessier chose muted stone and earth colours and a laid-back, sixties-inspired mood for the rooms, and high up, a glazed lookout lounge is the place to sit with a book while the shoreline drifts by.

The cabin plan is generous to families. Parents get a suite as wide as the boat itself, with two VIP rooms on the same level; below, four further cabins, two of them with extra Pullman berths for children, open into one another in pairs when a family wants to stay close.

She fits a family across generations, or friends who want a reset week of good food, sleep and gentle activity. She is less suited to a group chasing big parties or adrenaline, or to anyone who values a striking, showy interior: calm is what Nautilus was designed to deliver.