6band
The reading passage describes three theories that explain the possible sources of the strange sounds called 'quackers' detected by Russian submarines while patrolling the North Atlantic and the Arctic Ocean during 1960-1980. The reading passage describes three theories that explain the possible sources of the strange sounds called 'quackers' detected by Russian submarines while patrolling the North Atlantic and the Arctic Ocean during 1960-1980. Each one of these theories is rejected by the lecturer as unlikely causes o...