One night, while photographing biofluorescent corals with his team, marine biologist David Gruber’s camera was suddenly brightened by an unlikely sight: a turtle glowing in neon-like red and green colours. This accidental discovery set the beginning of Gruber’s ambitious study of marine life’s biofluorescence. From exploring the coral reefs of the Solomon Islands to diving beneath icebergs in the Arctic’s frosty waters, Gruber has been travelling across the oceans to better understand their secrets.