Beginning June 1, researchers from the Northeastern University Marine Science Center in Nahant will spend 31 days deep in the ocean with Fabien Cousteau, grandson of famed oceanographer Jacques Cousteau. On June 15 at 7 p.m., they will still be at the bottom of the sea but will engage in a live chat with people in Nahant as part of the center’s Cinema by the Sea Series, from the Aquarius habitat off the Florida Keys. The event, “Live from the Bottom of The Ocean :Mission 31” commemorates Jacque Cousteau’s 30 days in an undersea habitat, which was the basis for the 1964 film “World Without Sun”; excerpts from the film will be shown. The current mission intends to better the original mission by one day. The event is scheduled at the Marine Science Center, 430 Nahant Road. For information, contact outreach program coordinator Carole McCauley at 781-581-7370 or e-mail email@example.com.