The showers contains two Cannibals, one showering in a yellow suit and one man wearing only a snorkeling mask pacing around the room. Both characters seem to have a Breaking Bad theme. Like the bathroom, this room also doesn't contain an alarm switch nor any secret rooms. Several corpses are hanging in the room, either skinned or burnt.
The shower can save your life if you set yourself on fire, as you can extinguish yourself by using it.