The continental shelf here is about 600 meters (2, 000 feet) deep, and as the warm water from the open ocean meets the shelf, it continues to flow toward land and rises beneath the floating glacier.

在这个地方的大陆架是大约600米深，当从外面来的暖流碰上大陆架，就会沿大陆架向上升到浮着的冰川下面。

youdao

That thinking changed on March 28, 1979, when a small valve stuck open, cooling water escaped and the reactor core of TMI's Unit 2 began to melt.

CNN: Three Mile Island, 20 years later