Sounds picked up by hydrophones around the Salish Sea can be reported to researchers. Orcas make sounds like:
National Resources Defense Council: To Save Orcas, First Save Salmon
Tulalip News: Protecting our Salish Sea, the salmon and the southern resident orcas
Content Warning: violence against animals described between 9:00 and 12:00 in recounting the round-up of orcas at Penn Cove on August 8, 1970.
This episode covers some interesting topics about human relationships with orcas, including the integration of ceremony and using technology to send messages to orca relatives.