Lynne Cox became the first person to swim between the U.S. and the Soviet Union, crossing from Little Diomede to Big Diomede in the Bering Strait in 2 hours and 5 minutes.

Lynne Cox is an American long-distance open water swimmer, writer, and speaker. She is best known for being the first person to swim between the United States and the Soviet Union, across the Bering Strait, a feat which has been recognized for easing Cold War tensions between U.S. President Ronald Reagan and Soviet leader Mikhail Gorbachev.

Little Diomede Island or Yesterday Island is an inhabited island of Alaska. It is the smaller of the two Diomede Islands located in the Bering Strait between the Alaskan mainland and Siberia. The island has one town, also called Diomede.

Big Diomede Island or Tomorrow Island is the western island of the two Diomede Islands in the middle of the Bering Strait. The island is home to a Russian military base which is located midway along the island's North shore. The island is a part of the Chukotsky District of the Chukotka Autonomous Okrug of Russia. The border separating Russia and the United States runs north–south through the four-kilometer-wide strait that runs between the two islands.

The Bering Strait is a strait between the Pacific and Arctic oceans, separating the Chukchi Peninsula of the Russian Far East from the Seward Peninsula of Alaska. The present Russia–United States maritime boundary is at 168° 58' 37" W longitude, slightly south of the Arctic Circle at about 65° 40' N latitude. The Strait is named after Vitus Bering, a Danish-born Russian explorer.