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7. Aquatic grottoes – For the Truly stalwart
Exploring a delve is formerly whim-whams-wracking, but imagine doing it aquatic. That’s exactly what audacious( or perhaps slightly crazy) divers do when they explore the vast network of submerged grottoes around the world. These pitch- dark, winding coverts are both stunning and intimidating, offering some of the most extreme diving gests imaginable.