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Scientific American on the Medusa camera which was used in the filming
“Although very little sunlight penetrates to the deep sea, many deep dwellers produce a bioluminescent light…Widder and her colleagues therefore fitted Medusa with an electronic device that mimicked the bioluminescence that jellyfish produce when attacked to serve as a lure. It worked: Medusa first encountered a squid during its second deployment, igniting jubilation on the ship. “I just was blown away,” says Widder,” I couldn’t have been happier.”
Medusa ended up encountering a squid five times, culminating with a full view of one apparently attacking the camera system in a manner consistent with the alarm hypothesis. The squid was about 4 meters long, although giant squid can grow as large as 10 meters or more.
During a dive about a week after the first Medusa success in their Triton submersible, Kubodera and pilot Jim Harris had a face-to-face encounter. Once they had taken enough low-light footage, they turned on the sub’s bright main lights, expecting to spook the squid. Instead, the animal continued to feed on bait tied to the sub. For 18 mesmerizing minutes the pair watched as the huge animal’s skin shifted between unexpected gold and silver metallic hues.”