That would be Fraggle Rock, Mylor harbour, off the coast of Cornwall.* :) It was a diver release, which means a local dive club took the hatchlings down to the sea bed by hand. You can watch a dive video (not from this release) on this page and imagine what it was like to see little Toby wriggle his or her way to freedom.
* Actually Fraggle Rock--it appeared in the opening sequence to Fraggle Rock.
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