The Necker Nymph is a submersible vehicle operated by Virgin Aquatic^[1] from the 32-metre yacht Necker Belle,^[2] which is based at the Virgin Limited Edition resort Necker Island in the British Virgin Islands.^[3]

The Necker Nymph is the initial example of the DeepFlight Merlin class of positively-buoyant open-cockpit wet subs manufactured by Hawkes Ocean Technologies.^[4] It relies on hydrodynamic forces for anti-lift force. It is 4.5 metres long, capable of 360-degree "hydrobatic" manoeuvres, can dive up to 40 metres underwater, and seats one pilot and two passengers in an open cockpit (necessitating wearing scuba gear).^[5][6] Occupants have a "windscreen" to protect them from the water's slipstream.^{[citation needed]}