Green Grotto is 1,525 metres long and 12 metres deep and is characterised by numerous chambers and light holes and a subterranean lake – the Grotto Lake – occupies its bowels.
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And… if you want you can: unlike in the Blue Grotto, swim is not prohibited here. The entrance into the Green Grotto requires no particularity, it's easy accessible. While swimming through the crystalline water you will feel a great joy at the bottom of the heart.
Sunlight passing through an underwater cavity and shining through the seawater creates a blue reflection that illuminates the cavern. The cave extends some 50 metres into the cliff at the surface, and is about 150 metres (490 ft) deep, with a sandy bottom.
The Blue Grotto lets you dive down to a depth of 100 feet (30 meters) in crystal clear water all the way down at a water temperature of 72 degrees Fahrenheit (23 degrees Celsius) all year round.
Trillium Gap Trail meanders through an old-growth hemlock forest and actually runs behind the 25 foot high waterfall. The cool, moist environment near the falls is ideal for salamanders and summer hikers. The hike is 3 miles roundtrip and considered moderate in difficulty.
Entrance to the Blue Grotto is possible only by boarding small rowboats which hold a maximum of four passengers at a time. The entrance ticket must be purchased at the floating ticket office at the cave entrance.
Many people think of the open sea as the domain of sharks, but perhaps surprisingly, several species of sharks prefer to inhabit caves and even small crevices in reefs. Certainly those species known as nurse sharks routinely wedge themselves under ledges when resting.