SKY_BEAM_OK makes me wonder if Sky Fortress is about to rock and roll.

September 7, 1776

World’s first submarine attack

On this day in 1776, during the Revolutionary War, the American submersible craft Turtle attempts to attach a time bomb to the hull of British Admiral Richard Howe’s flagship Eagle in New York Harbor. It was the first use of a submarine in warfare.

Source: history.com/this-day-in-history/worlds-first-submarine-attack