The brightly coloured coral reefs of the Red Sea are an underwater paradise ... placing a dead black sea urchin - its body the size and shape of a flattened tennis ball - into my hands.

“Eating sea urchins is actually a way to help the kelp,” said Lamb, pointing to people who are “diving and collecting urchins ...

Even with the recent success, however, it remains to be seen if these mighty underwater ... purple urchin. After hungry purple urchins mow down kelp forest, they lay dormant on the sea bed in ...

Warming sea water has triggered an explosion in the ... Otter Force One, an autonomous underwater robot that can gather the aquatic interlopers and put them in a bag for removal.