The silverback gorilla who sent ZSL London Zoo into lockdown made an "opportunistic" exit through two unlocked doors into a corridor where a keeper was working and drank five litres of undiluted squash.
Professor David Field, the ZSL's zoological director, said Kumbuka was kept calm by the member of staff, with whom he had a "close bond".
Armed police were called to the central London attraction and visitors were evacuated when the alarm was raised following the ape's bid for freedom on October 13.
Before being tranquillised and moved back to safety, Kumbuka used his moment of freedom to glug the blackcurrant squash. Legend.
Despite the animal's security breach, Professor Field said the whole affair was "less dramatic than some would have you believe".
He added: "I can certainly tell you that there were no broken locks, Kumbuka did not smash any windows, he was never 'on the loose', and his normal gorilla posturing reported by visitors earlier in the day was unrelated to the incident."
Kumbuka's daring escape began after he was called into his enclosure for dinner shortly after 5pm.
Professor Field said that the human error which facilitated the escape was rare and the risk of mechanical failure meant having an automated security system posed a "greater" threat.