Deepest ‘sea sinkhole’ ever found is at least 1,380ft down with mystery tunnels but scientists still haven’t hit bottom

NEW research has revealed the world’s deepest blue hole which travels down in length longer than the Empire State Building and its true depth remains a mystery. 

The Taam Ja’ Blue Hole located in the Chetumal Bay off the Yucatan Peninsula, in Mexico, extends 1,380+ feet below sea level making it 390 feet deeper than the previous record holder.