A crane on a ship deck hoisted a 502-pound video camera and plopped it into the ocean for a 3,000-foot descent to the world of neon-glowing jellyfish, bug-eyed red rock cod and other still unknown slithery critters. The so-called Eye-in-the-Sea camera would be added to the first observatory operating in deep sea water and become part of a new kind of scientific exploration to assess the impacts of climate change on marine life. “Bye bye,” said marine scientist Edith Widder, as the bulking Web camera splashed into the water and disappeared into blackness. “Hope it works.”