Another consideration is the relationship. between insulation class, temperature rise, and ambient temperature. The insulation. class rating designates the maximum. operating temperature for a winding. The. temperature rise is the difference between the.
China claims it has discovered the world's largest hole, and it's in one of the most dangerous places on the planet. 1  Jul.  Good news: China claims it has discovered the world's largest hole. On Wednesday, state broadcaster CCTV announced that the newly found dragon's hole, a 984-foot (300-meter) cavern in the disputed waters of the South China Sea, is now the world's largest hole.
Deanâs Blue Hole, The Bahamas â The worldâs deepest known blue hole (underwater sinkhole) with seawater. It plunges 202 meters (663 ft) near Long Island, Bahamas. Deanâs Blue Hole is roughly circular at the surface, with a diameter ranging from 25 to 35 meters (82â115 ft).