Abstract : The marine mammal sound work supported by the last component of this Grant included work on monitoring calls produced by deep water whales of the North Pacific, as well as organization of a digital archive of the WHOI marine animal sound collections. The program of monitoring the calling whales across the North Pacific using U.S. Navy SOSUS and other systems has continued to be productive, with regular measures of the seasonal distribution of the different whale species. The organization of the digital acoustic data was successfully completed. Both components of this program have provided important new information about the acoustic behavior of these calling marine species.