Mars 2MV-4 - Mars 1962A

Launch date: 24 October 1962
Nation: USSR
Outcome: failure

Wikipedia - "With the Cuban Missile Crisis unfolding, the Soviet military ordered the Mars probe's launch vehicle pulled from LC-1 so they could install a nuclear-tipped R-7 missile on it. However, the US and Soviet Union quickly reached a compromise and defused the potentially disastrous geopolitical situation, so the launch could proceed normally. Mars 2MV-4 No.1 spacecraft was launched at 17:55:04 UTC on 24 October 1962, atop a Molniya 8K78 carrier rocket flying from Site 1/5 at the Baikonur Cosmodrome. The lower stages of the rocket performed nominally, placing the payload and the Blok L upper stage into low Earth orbit. When the Blok L ignited following a coast phase, lubricant leaked out of the turbopump, which consequently seized up and disintegrated. This caused the main engine to explode, destroying the upper stage and spacecraft. Twenty two pieces of debris from the spacecraft and upper stage were catalogued, which decayed between 29 October 1962 and 26 February 1963"

"Mars 1962A" Launched on an SL-6 rocket, the mission achieved geocentric orbit, but broke up shortly afterwards.

Craft was: Mars 2MV-4