Det er en af de undersøiske strukturer, den mest fotograferede i verden: den Store Blå Hul, et jordfaldshul ubåd, som ligger i hjertet af Lighthouse Reef, en lille atol omkring halvfjerds km fra kysten af Belize, fik sin berømmelse takket være den franske opdagelsesrejsende Jacques Cousteau, der i 1971 erklærede ham for at være en af de fem bedste dykkersteder i verden, der er mest fascinerende, før calarvisi i første person.
Dette cirkulære karst sinkhole, 318 meter bredt og 124 meter dybt, er det næststørste blå hul i verden efter Dragehullet i Det Sydkinesiske Hav. Det menes, at limestone grotte, hvorfra den stammer, der er blevet dannet under den sidste istid, hvor vandstanden var lavere end i dag, og det har derefter været oversvømmet med vand, indtil dens vægge over og kollapsede, der giver anledning til "hul", som vi ser.
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