 Four days later , while searching for a U @-@ boat in the area of <unk> Rock , the destroyer received word that the <unk> Lightship had rescued survivors from a fishing vessel . Wainwright rendezvoused with the craft to interview the four seamen of the smack Our <unk> . They revealed that the U @-@ boat — which turned out to be UC @-@ 48 — was of the latest type Germany had in action . The destroyer relieved the lighthouse vessel of the four fishermen and continued the search until dusk , when she headed back to Queenstown to land the rescued men . 
