Unix Timestamp: 583632000
Thursday, June 30. 1988, 12:00:00 AM UTC

Roman Catholic Archbishop Marcel Lefebvre consecrates four bishops at Écône, Switzerland for his apostolate, along with Bishop Antonio de Castro Mayer, without a papal mandate.

The Fatih Sultan Mehmet Bridge in Istanbul, Turkey is completed, providing the second connection between the continents of Europe and Asia over the Bosporus.

The first reported medical waste on beaches in the Greater New York area (including hypodermic needles and syringes possibly infected with the AIDS virus) washes ashore on Long Island. Subsequent medical waste discoveries on beaches in Coney Island and in Monmouth County, New Jersey force the closure of numerous New York–area beaches in the middle of one of the hottest summers on record in the American Northeast.

Iran Air Flight 655 is shot down by a missile launched from the USS "Vincennes".

The Piper Alpha production platform in the North Sea is destroyed by explosions and fires, killing 165 oil workers and 2 rescue mariners.