The huge parachute that NASA’s Perseverance rover used to land on the Red Planet contained a secret message. It was encrypted by a puzzle lover on the spacecraft maintenance team.

Systems engineer Ian Clarke used binary code to write “Dare Mighty Things” in the orange and white stripes of a 21-meter parachute that deployed as the NASA spacecraft landed on NASA’s Perseverance rover. It also included the GPS coordinates of the mission headquarters at the Jet Propulsion Laboratory (JPL) in Pasadena, California.

Clarke, a crossword lover, came up with this idea two years ago.

Only about six people knew about the encrypted message before the rover landed on Thursday, he said. The engineers waited for the parachute image to be available on Earth before releasing a clue during a televised press conference on Monday.

It took space enthusiasts just a few hours to figure out the encrypted message, Clark said. Next time, he noted, “you have to be a little more creative.”

“Dare Mighty Things” is a line from one of President Theodore Roosevelt’s speeches. These words, which translate to “Dare Great,” are the JPL mantra that adorns the walls of the NASA center.