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.
The Great Blue Hole is a large submarine sinkhole off the coast of Belize. It lies near the center of the Lighthouse Reef, a small atoll 36 miles from Ambergris Caye. The hole is circular in shape, 984 ft across and 407 feet deep. We dive the Blue Hole to a depth of 130 feet where we explore the stalactites.