Once again scientists used recordings of other Humpbacks to try to entice the animals downstream towards the deep sea.
Yesterday the recordings were only of Humpbacks from the waters off the Alaskan coast.
Today the signals were a bit different according to Joe Cordero of the National Marine Fisheries Service.  
 
We’re also including recordings of Humpback whales near California. Previously we were only using the Alaska sounds.  So we’re going to see if the California sounds might have a better result.
 
If there’s no progress by this evening scientists plan on backing off this weekend to see if the whales take the initiative to head toward the ocean.
If the mammals don’t show any inclination to leave the port area by early next week, officials will consider attempting to herd them downstream.