The phrase "suicide plunge" is used to describe a sudden and reckless jump or dive that could potentially result in a person getting hurt or killed. Full definition
The horrified look on Pierre's face when the tart took a suicide plunge was PRICELESS! (cookingninja.com)
Cassini is clearing its memory ahead of its dive into Saturn's atmosphere early Friday morning (Sept. 15), a suicide plunge that will bring the storied spacecraft's 20 years in space to a dramatic, fiery end. (space.com)
Indeed, the main reason the Cassini team sent the probe on its suicide plunge today was to ensure that the orbiter would not contaminate Enceladus (or fellow Saturn moon Titan, which also may be habitable) with microbes from Earth. (space.com)