Prior to the Deepwater Horizon spill in the Gulf of Mexico, the Exxon Valdez was the largest spill to ever occur in U.S. coastal waters. In this episode, we talk with NOAA marine biologist Gary Shigenaka to find out how marine life is faring today in Prince William Sound, Alaska. We also look at lessons we might learn from this environmental disaster in light of growing oil exploration and shipping traffic in the Arctic.