Cosmology from the Full Mass Distribution of Compact Binaries

: Military or naval reports on specific siren models, such as the Navy types S-1 or S-2 , which include detailed performance testing for sound pressure and endurance.

This episode originally aired on , on Freeform. It centers on the intensifying conflict between the mermaids and the military, as well as the personal stakes for the residents of Bristol Cove. Key Plot Developments

: To protect the mermaid colony from the increased police and federal presence, Ryn remains in town while Helen leads the other mermaids to a remote sanctuary in the mountains.

: The discovery of a body, later identified as Xander’s father (killed in the previous season), brings federal agents to Bristol Cove. This investigation complicates the efforts of Ben, Maddie, and Ryn to keep the mermaids' presence secret.