In today’s Discovery: What readers should know about the "blood moon” total eclipse (one of the longest in decades), deep-diving whales are inspiring possible cancer and stroke treatments, and the surprising way DNA is being used for data storage. 

But first: The shipwreck off Bodrum that transformed underwater archaeology. 

Tourists of any sort were an unusual sight in Bodrum in 1961. So when a large group of for­eigners arrived with a mountain of newfangled scuba diving gear and rented a big run-down house for the summer, they were greeted with a mixture of curiosity and suspi­cion, especially when word began to circulate that they were going to be diving on an old wreck that a local sponge diver had found a few years earlier. In a sponge diving community like Bodrum, it could mean only one thing: treasure.

Today’s newsletter was edited and curated by William O’Connor and produced by Alisher Egamov. Did someone forward this to you? Sign up for our other newsletters here.