Tropical Storm One was an extremely deadly cyclone which developed in the central Bay of Bengal on May 22, strengthened to a peak of 70 mph winds before hitting Bangladesh on the 25th.

The storm brought torrential rains and flooding, killing around 11,069 people[1][2] and leaving hundreds of thousands homeless.

On May 22, a depression formed in the Bay of Bengal, it rapidly intensified to a tropical storm on May 24, it made landfall and dissipated on May 25.

Every single person on the island of Urir Char, approximately 500 at the time, is thought to have been swept into the Bay of Bengal.

A pilot who flew over the island said it was swept by waves, like it was inside the fireball on an atomic bomb.