From the Internet:
For the filming of Thunderball two Vulcans were used for the ground and flying sequences and as well as scale model work a full size mock-up of a Vulcan was built in the Bahamas and submerged in the water.
The remains of the Vulcan are in poor condition owing to the fact that they were destroyed by explosives following filming to prevent them appearing in other films. After nearly half a century in the water what remains is barely recognisable, but can still be reached using a local dive centre.
I don't know whether or not the large scale models used in the film have survived.