International Date Line International Date Line The International Date Line (IDL) is an imaginary line of demarcation on the surface of Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next. It passes through the middle of the Pacific Ocean, roughly following the 180° line of longitude but deviating to pass around some territories and island groups. The IDL is roughly based on the meridian of 180° longitude, roughly down the middle of the Pacific Ocean, and halfway around the world from the Greenwich meridian. In many places, the IDL follows
What Lies Below be left alone." Supervising producer Jeff Vlaming wrote "What Lies Below", his second episode of the season. Filmmaker Deran Sarafian served as the director, his first and only "Fringe" directional credit. The episode featured one-time guest appearances by actors Demore Barnes, Geoff Pierson, Conrad Coates, Natassia Malthe, and David Richmond-Peck. Actor Joshua Jackson, who plays an infected Peter Bishop in the episode, noted during shooting that he found inspiration from "imagin[ing] the worst hangover I've ever had and multiply it by ten". Actress Jasika Nicole was pleased that the writers decided to let her character discover Walter's secret, commenting "Astrid