SpaceX Starship
Mk3's name changed to SN1 (serial number 1). On 28 February 2020, SN1 crushed itself during a cryogenic proof test. It is because of a leak in the bottom tank. On 8 March 2020, SN2's tank completed its only cryogenic proof test. On 3 April 2020, during the SN3 cryogenic proof test, a valve leaked liquid nitrogen inside its bottom tank. This causes the vehicle to lose pressure and crush itself. On 29 May 2020, SN4 had its fifth successful static fire test. But, after the test, the connected propellant pipe made SN4 explode.