On November 20, 1980, a 14-inch drill bit from a Texaco oil drilling rig on the surface of Lake Peigneur in Iberia Parish, Louisiana cut through a working salt mine 4,000 feet below.

The result marks one of the freakiest oil drilling disasters ever, and clearly one of the biggest engineering fails of all time.

Read more – Freakiest Oil Drilling Disaster Ever was 30 Years Ago Today.