Wernher's distress signal

Wernher's distress signal is picked up on the Pip-Boy with the Fallout 3 add-on The Pitt.

Background
It is a call for help received by a runaway slave named Wernher who has just escaped from the Pitt. Tracking down the origins of this broadcast leads to Wernher at the north end of the map in a fight with three Pitt raiders. This also triggers the quest Into The Pitt.