December is a summer month in Antarctica, and the warmer temperatures and constant daylight make it the best time for scientists to work. Diving for sea urchins at the bottom of the frigid sea, marine biologist David Ginsburg wonders, How can I celebrate Hanukkah when there is no nightfall? Can I light a menorah while the sun is still shining? Take a trip to McMurdo Research Station and join his most unusual underwater holiday celebration.