It’s no secret the deep sea is home to some strange-looking animals, so might we introduce you to yet another weirdo: the seven-arm octopus, AKA “the blob octopus”. This ocean giant can weigh up to 75 kilograms (165 pounds), but despite its huge size, it's rarely been seen alive. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Now, a recent sighting by the ocean experts over at the Monterey Bay Aquarium and Research Institute (MBARI) has yielded some incredible footage. It marks just the fourth time they’ve encountered this animal in 40 years of ocean exploration.

It was spotted via a remote operated vehicle (ROV) known as Ventana , which was cruising in Monterey Bay as part of a research expedition last month. On that day, Senior

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