Help make Alexa smarter on Alexa Answers. Sign in with Amazon

Science

What's the world's deepest hole?


After 24 years of digging, and several branches in the hole, the deepest branch of the Kola Superdeep Borehole stopped in 1994 at about 7.5 miles. It's only nine inches in diameter at the bottom. It is still the deepest hole in the world, and the process of drilling was incredibly difficult.

{{ relativeTimeResolver(1550168784507) }}

LIVE
Points points 90
Rating 0

Similar Questions
Sign in to view all similar questions

Join Alexa Answers

Help make Alexa smarter and share your knowledge with the world

LEARN MORE