Siren 2X15 promo and sneak peeks

Promo for 2X15, "Sacrifice"- [Spoiler (click to open)]'Ben and Xander are left dealing with a shocking discovery about Chris and his connection to the military. Meanwhile, Helen and Maddie reluctantly seek help from the hybrids as the threat of extinction looms over the mermaids. Ryn encounters the journalist who continues to chase his theories on mermaids to increasingly desperate ends.'

3 sneak peeks.

SOURCES: #1, #2, #3, #4