This exemplar of Stygiomedusa gigantea, the giant phantom jelly, was spotted by an undersea remotely operated vehicle (ROV) from the Monterey Bay Aquarium in California at a depth of 990 metres in Monterey Bay. The bell is one metre in diameter and the four arms (which have no stinging tentacles) can grow to more than 10 metres long. The species has been known since 1899, but has only been sighted around 110 times since then, nine times by the Monterey Aquarium’s ROVs. It is believed to be common and found in all but the Arctic Ocean, but its deep sea habitat makes it rarely observed and, due to its fragility, rarely collected.