what is a blue hole?( people are really worse , they report my relevant and educational questions+Answers also
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Answer:
A blue hole is a large marine cavern or sinkhole, which is open to the surface and has developed in a bank or island composed of a carbonate bedrock. Their existence was first discovered in the late 20th century by fishermen and recreational divers.
The Blue Hole itself is no more dangerous than any other Red Sea dive site but diving through the Arch, a submerged tunnel, which lies within the Blue Hole site, is an extreme dive that has resulted in many accidents and fatalities.
Most blue holes are formed from sinkholes or caves that develop slowly over time, as rock begins to erode and collapse. Many blue holes were formed during the last Ice Age, after sea levels rose and filled existing sinkholes with water.
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