Question

which is the deepest hole in the world?​

Answer 1

The Kola Superdeep Borehole was the deepest hole in the world. It is 9 inches in diameter, but it is of 40,230 feets (12,262 meters). It took almost 20 years to reach that 7.5 mile depth.....

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Answer 2

kola superdeep borehole- EARTH

black hole- SPACE

dean's blue hole-OCEAN