Siren: 2г—7 Online

: While in the mountains, the mermaids discover historical evidence linking humans and mermaids, providing vital lore regarding their shared past.

: 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. Siren: 2Г—7

: 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. : While in the mountains, the mermaids discover

: In gravitational-wave astronomy, "standard sirens" are used to measure cosmic distances. Researchers often compare results between second-generation (2G) and third-generation (3G) detector networks. : While in the mountains