Image: Naughty Dog / PlayStationOfficial screenshot from Naughty Dog / PlayStation.
Waterlogged is the bronze trophy for riding the motorized platform across the flooded sewer room with Henry and Sam in The Suburbs. Sam cannot swim, so Ellie has to restart a generator on the far side before the platform will carry the others over.
Open the gate, get Ellie over to the generator on the pallet and slip past the two sleeping clickers. Once the platform runs, step on with Henry and Sam and ride it to the other side.