N119NY helo - NYC Dept of Environmental Protection Police.
Spent some time checking the Kensico Dam.
'sokay I kekked when I read it and realised the multiple meaning.
Didn't notice Valhalla but a quick search came up with this - The Valhalla Murders a netflix series based on true events in 1940's Iceland, about an institution where young boys 7-14yo were abused by staff.
https://en.wikipedia.org/wiki/The_Valhalla_Murders