Engineered by Nature: The Great Blue Hole

Engineered by Nature: The Great Blue Hole — page 1 — The Great Blue Hole is very wide and deep

Engineered by Nature: The Great Blue Hole — page 2 — CHAPTER 1 DOWN IN THE DEEP A team of scientists and explorers is working to map the inside of the Great Blue Hole in Belize The team climbs into a submarine The submarine has a large clear ceiling Water burbles over the machine as it begins its slow dive

Engineered by Nature: The Great Blue Hole — page 3 — At first the water looks bright blue Coral branches out from the rock ledges Sharks and fish swim slowly around When the group reaches 40 feet 12 m they see the first ledge Here the hole becomes a little narrower It starts to get darker They sink deeper and deeper Fewer animals swim around Below 90 feet 27 m the hole gets wider and darker The team uses the submarine's lights to see the surroundings There are caves with stalactites and stalagmites These formations are a sign that the Great Blue Hole used to be a dry cave Eventually the submarine reaches about 300 feet 90 m It looks like there is a cloud in the water A toxic gas spreads out like

Engineered by Nature: The Great Blue Hole — page 4 — Divers can explore the Great Blue Hole's stalactites and stalagmites a blanket It blocks light from the surface Beneath the blank there no oxygen or living things It is completely black

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