Geographically, Bermuda sits atop part of a volcano’s caldera, with the remainder of the caldera forming submerged reefs.
The Riviera docked at the Royal Naval Dockyard and passage to it is along a narrow channel through the reefs.
A key feature of the Dockyard is a fortified Keep which houses a museum and dolphin pool. The Dockyard is the centre of
the 2017 America’s Cup and is home to 5 of the Teams - see the America’s Cup gallery in this TransAtlantic 2017 collection.
Royal Naval Dockyard Wikipedia