David Bright, a leading researcher into underwater exploration and shipwrecks, has died after diving to the site of the Andrea Doria off Nantucket, where he was working in preparation for the wreck's 50th anniversary. He was 49.  See Full Story.

   Bright surfaced from a dive and went into cardiac arrest.  It is unclear whether he suffered DCS or AGE, a stroke, heart-attack, or some other condition.  He had done over 120 dives on the Doria.

   Bright's interview with PBS about the Doria can be seen here.