Walsingham Cave is in a cave park in Bermuda. A nearby Pond, Blue Grotto Pond obviously had caves in its walls, and I surmised that they could be physically connected to make one cave. On 31 December 2010 I added 250 feet of line, and connected the two caves via an underwater crawlway.
Walsingham Cave Photo: Cliff Vachon via Panaramio
Blue Grotto Pond Photo: Andy Triggs via Panaramio