Dear detective tapes

The dear detective tapes are a series of four holotapes

Locations
Left in the Fens Street sewer by the Fens Phantom, a pre-War serial killer, to monologue his kills to a detective on the trail of his killings.
 * Tape 1 can be seen right when coming down the ladder from the street.
 * Tape 2 can be found on a barbecue next to a skull.
 * Tape 3 can be found on a table next to a yellow chair in a room with a mannequin, unlit candles on the shelves, and various crates.
 * Tape 4 can be found near the end, in an alcove with a safe behind a chain fence.