Due to the technical improvement of several years ago, transportation through Golmud-Lhasa pipeline has undergone the transition from the floating tank process to the tight line process.

Detective Delaney entered the water without an air tank, but only his diving suit, mask and snorkel and approached a woman floating in a life vest, he said.

By the time the survivors were found, no trace remained of three of the fish. A fourth was found floating in the tank.