There's a reason people say cats have mills sex videosnine lives.

On Monday afternoon, London's Royal Docks tweeted some tense CCTV footage of Felix, the Royal Docks Management Authority's office cat.

Felix had been in a scrap with a rival cat on the banks of the river Thames and lost his footing. Luckily his tumble into the river was spotted by a nearby worker called Scott, who dashed to Felix's rescue and managed to pull him free in time.

The clip below has pretty much everything you'd need in a video: cats, drama, and -- most importantly -- a happy ending:

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"Felix the RoDMA office cat had a lucky escape as Scott rushed save her from the water after a tussle with another cat!" London Royal Docks wrote on Twitter. "She is safe & sound."

Good work, Scott.