By “nobody” they mean, that’s a hell of a depth. It requires specialized training and equipment, and exceeds the recommended depth limit by about a factor of four or five. The world record-holder dropped to over 300 meters in just 12 minutes, but it took him 15 hours and lots of help from the surface to ascend. The guys shown above are equipped with rebreathers.
http://scuba.about.com/od/scuba101/p/How-Deep-Can-You-Scuba-Dive.htm
http://www.diversalertnetwork.org/medical/articles/how_deep_is_too_deep
http://www.scientificamerican.com/article/man-sets-world-record-for-deepest-underwater-dive/