Mapping the Arctic sea floor; avoiding whales in Calif.; benthic maps (Episode 3)

This week, we bring you news about a recent expedition to map an unknown sea floor in the Arctic. Then we travel to California, where staff of the Channel Islands National Marine Sanctuary work to prevent ships from striking blue whales in the Santa Barbara Channel. Finally, we head down to Texas to talk about a new digital map of underwater vegetation in the Coastal Bend region near Corpus Christi.