Alpena has become a hotbed of research activity as experts from around the world converge on rare underwater sinkholes which may hold to key to life on earth.
Sinkholes in Lake Huron could hold clues to the oxygenation of Earth 35 hundred million years ago.
That’s because the sinkholes are home to purple mats – microbial organisms that are distant cousins of some of the first life on Earth.
Alpena is known for being the “Sanctuary of the Great Lakes”.
A common condition from deep water diving is one reason why the local hospital features two hyperbaric chambers. Continue reading