What are blue holes? | How Blue holes are formed, in which only bacteria can survive?

What are blue holes? | How Blue holes are formed, in which only bacteria can survive?

blue holesThese are the big tunnels that can be seen in oceans.  These are called ‘Blue holes’.  Each blue hole is around 100 -120 meters deep.  The depth of the Great Blue Hole is 203 meters.  The reason for formation of these Blue holes is that the sea level in ice age was at least 120 meters less than the present level.  Big formations of soil, stones and minerals were destroyed at the end of the ice age.  Blue holes were formed then.  Only bacteria can live in these blue holes.  These are not convenient for ocean creatures to live.  It is a strange thing that there are holes in the ocean also.

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