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Magma in Earth's Mantle Forms Deeper Than Once Thought. Study simulating pressures in mantle beneath the ocean floor shows that rocks can melt at depths up to 250 kilometers. When magma reaches Earth's surface and erupts from a volcano, it becomes lava.
Blue Grotto is actually a sinkhole with good visibility. Depths reach 100 ft. Upon entering the sink you will encounter a very large cavern with writing on the walls. At a depth of 30 feet there is a fresh air bell so you can take off your mask and breath some fresh air. Continuing down, there is a large shaft that slopes down at a 90 degree angle. At around 90 feet you will encounter silt that can be easily stirred up. There are lights at 30 ft to illuminate the cavern. The owner, is very friendly and also manufactures dive, wreck and video lights.