ELI5: Explain Like I'm 5

Leigh light

A Leigh Light is like a big flashlight that was used during World War II. It helped planes see things that were in the water, like enemy submarines. The light was so bright that it could shine through the water and show the submarine to the pilots. The light was named after a man named Humphrey de Verd Leigh who invented it. It was a very important tool during the war because it helped the pilots find the enemy submarines, and protect their ships and crews.