The two times humans have reached the deepest part of the ocean, it required a foot-thick flawless metal sphere with barely enough internal space to sit down.
In August 2011, Speth and his chief engineer finally broke through more than two meters of earth and reinforced concrete and the shelter's 278-millimeter-thick ceiling to emerge into a 40-square-meter space, divided into five interconnecting rooms by heavy metals doors.
The conversion took five years, and involved removing the roof, more than 10 feet thick, with a diamond saw, as well as extracting interior walls to make space for the art.