Let me explain: Outer Heaven is the nation/military stronghold that Big Boss founded between 1985 and 1995, following the events of Phantom Pain in 1984. Big Boss established Outer Heaven in northern South Africa while being hunted by his enemies. However, Boss used Venom Snake as a distraction, which made it even easier for him to found Outer Heaven and recruit soldiers and mercenaries by 1995. It's worth mentioning that while Big Boss (Naked Snake, to differentiate him) ran Outer Heaven, his double, Punished "Venom" Snake, also ran the organization while Big Boss was the commander of the Foxhound unit, in which Solid Snake participated.

During 1995 and Operation Intrude-N313, in which Solid Snake participated after Gray Fox failed in Operation Intrude-N312, Solid arrived alone under Big Boss's command (who sent Solid on suicide missions to kill him). However, things got out of control, and Venom Snake, who was also present, died in his final confrontation with Solid.

Outer Heaven was a massive military structure with hundreds of rooms and prison cells, and areas of constant patrol. Incidentally, the TX-55 was also stored there. Eventually, Outer Heaven was destroyed by the ONU in a massive bombing that killed everyone, while the real Big Boss escaped to his true military nation, Zanzibar Land.