Scientists find a blue hole so deep that they can’t reach the bottom

The stunning underwater sinkhole holds mystery for scientists (Picture: Getty)

There’s an underwater sinkhole off the coast of Belize that is so deep, scientists aren’t sure how far down it goes.

In Chetumal Bay, sinkhole Taam ja’, a ‘blue hole’, has proved to be a challenge for researchers trying to measure its depth.

Using sonar to map the hole, they found Taam ja’ is roughly 900 feet deep – but those measurements might be inaccurate, due to temperature and salinity changes in each layer of water.