On Saturday, August 6, at 8 p.m. leave the world of land and sky and go deep under the sea. Be prepared to watch with awe and a fair bit of concern. Our oceans are places of mystery and grandeur but they are also like the proverbial canary in the coal mine, visual bellwethers for the assault on nature being wrought by global warming and other man-made issues.

The show features Brian Skerry, an award winning photojournalist specializing in marine wildlife and underwater environments. Mr. Skerry is a photographer for National Geographic and is the New England Aquarium’s explorer-in-residence: Could there be a cooler job title anywhere?

The program at the Tabernacle in Oak Bluffs will highlight Mr. Skerry’s work. These images and his accompanying talk entitled Window to the Sea are designed not just to delight but to increase awareness about the sea.

In Mr. Skerry’s words, “The oceans are in trouble. There are serious problems out there that are not clear to many people. My hope is to continually find new ways of creating images and stories that both celebrate the sea, yet also highlight environmental problems.”

For more details, call 508-693-0525.