Alia Boeing 707, chartered by Nigeria Airways, crashed upon landing at Nigeria's Kano Airport after one of its landing gear struts collapsed. 176 of the 202 people on board perished, leaving 26 survivors. On March 3, 1974, Turkish Airlines Flight 981 crashed in northern France after a cargo hatch blowout, killing all 346 people aboard. On April 4, 1975, the rear loading ramp on a USAF Lockheed C-5 Galaxy blew open mid-flight, causing explosive decompression that crippled the aircraft. 153 were killed in the incident while 175 survived. On November 10, 1975, the U.S. Great Lakes bulk freighter SS Edmund Fitzgerald foundered on Lake Superior with the loss of all 29 crewmen. On September 10, 1976, in the Zagreb mid-air collision, a British Airways Hawker Siddeley Trident and an Inex-Adria Aviopromet Douglas DC-9 collided near Zagreb, Yugoslavia (now Croatia), killing all 176 aboard both planes and another person on the ground. On March 27, 1977, two Boeing 747s (a KLM and a Pan Am) collided on the runway in heavy fog at Los Rodeos Airport in Tenerife, Canary Islands, Spain, killing 583 people – the worst aviation disaster on record. On January 1, 1978, Air India Flight 855 crashed into sea off the coast of India, killing all 213 aboard. On September 25, 1978, PSA Flight 182 collided with a private Cessna 172 over San Diego, California, and crashed into a local neighborhood. All 135 on the PSA aircraft, both pilots of the Cessna, and 7 people on the ground (144 total) were killed. On May 25, 1979, American Airlines Flight 191, outbound from O'Hare International Airport in Chicago, Illinois, lost an engine during take-off and crashed, killing all 271 on board and 2 others on the ground. It was and remains the deadliest single-plane crash on American soil. On November 28, 1979, Air New Zealand Flight 901 crashed on the flanks of Mount Erebus in Antarctica, killing all 257 people on board. On March 28, 1979, there was a partial meltdown of the Three Mile Island Unit 2 reactor in Pennsylvania, United States. It is the most significant accident in U.S. commercial nuclear power plant history. Worldwide trends Superpower tensions had cooled by the 1970s, with the bellicose US–Soviet confrontations of the 1950s–60s giving way to the policy of "détente", which promoted the idea that the world's problems could be resolved at the negotiating table. Détente was partially a