Following concern about the long-term effects of suffering from Covid-19 infection, the UK Diving Medical Committee produced a scorecard to help divers assess their personal risk and signpost the steps to be taken in being signed off as fit to dive.

The inadvertent discovery of sea life on a boulder beneath an Antarctic ice shelf challenges our understanding of how organisms can live in environments far from sunlight, according to a team of biologists.

Richard Carapaz is Ecuador's second Olympic medalist, Brandon McNulty hits best US result since 2012, and how Tour de France riders fared in the Olympics. .