Historical timeline for June 23

Twelve boys and an assistant coach from a soccer team in Thailand are trapped in a flooding cave, leading to an 18-day rescue operation.

A series of terrorist attacks take place in Pakistan, resulting in 96 deaths and wounding 200 others.

Brexit: The United Kingdom votes in a referendum to leave the European Union, by 52% to 48%.

The last of Syria's declared chemical weapons are shipped out for destruction.

Militants storm a high-altitude mountaineering base camp near Nanga Parbat in Gilgit–Baltistan, Pakistan, killing ten climbers and a local guide.

Nik Wallenda becomes the first man to successfully walk across the Grand Canyon on a tight rope.

Ashton Eaton breaks the decathlon world record at the United States Olympic Trials.

American social news and discussion site Reddit is founded in Medford, Massachusetts by Steve Huffman and Alexis Ohanian.

The 8.4 Mw southern Peru earthquake shakes coastal Peru with a maximum Mercalli intensity of VIII (Severe). A destructive tsunami followed, leaving at least 74 people dead, and 2,687 injured.

NASA's Space Station Processing Facility, a new state-of-the-art manufacturing building for the International Space Station, officially opens at Kennedy Space Center.

Sonic the Hedgehog is released in North America on the Sega Genesis platform, beginning the popular video game franchise.

A terrorist bomb explodes at Narita International Airport near Tokyo, killing two and injuring four. An hour later, the same group detonates a second bomb aboard Air India Flight 182, bringing the Boeing 747 down off the coast of Ireland killing all 329 aboard.

A fire at a house in Hull, England, which kills a six-year-old boy is passed off as an accident; it later emerges as the first of 26 deaths by fire caused over the next seven years by serial arsonist Peter Dinsdale.

Title IX of the United States Civil Rights Act of 1964 is amended to prohibit sexual discrimination to any educational program receiving federal funds.

Watergate scandal: U.S. President Richard M. Nixon and White House Chief of Staff H. R. Haldeman are taped talking about illegally using the Central Intelligence Agency to obstruct the Federal Bureau of Investigation's investigation into the Watergate break-ins.

Warren E. Burger is sworn in as Chief Justice of the United States Supreme Court by retiring Chief Justice Earl Warren.

IBM announces that effective January 1970 it will price its software and services separately from hardware thus creating the modern software industry.

Seventy-four people were killed and 150 others injured in a stampede at a football match between Boca Juniors and Club Atlético River Plate in Buenos Aires, Argentina.

Cold War: U.S. President Lyndon B. Johnson meets with Soviet Premier Alexei Kosygin in Glassboro, New Jersey for the three-day Glassboro Summit Conference.

The Antarctic Treaty System, which sets aside Antarctica as a scientific preserve and limits military activity on the continent, its islands and ice shelves, comes into force.