Germany is continuing with is U-boat campaign, though at this stage it is clearly not about to force the British to throw in the towel. Allied countermeasures against the U-boats mean that it is becoming ever harder for them to prey on merchant shipping. Aside from dazzle camouflage, which may be just an ineffectual morale booster for Allied sailors, the increased use of convoys means that the U-boats can no longer attack civilian ships with impunity. The Allies are also more able to attack U-boats underwater than before, thanks to improved depth charges that can sink or force to the surface a submarine.
Another weapon being used against the submarines is the mine. Last year an attempt was made to block off the Channel to U-boats using a combinations of mines and nets. That failed when strong currents damaged the barrage but now the British try again. This time they place minefields deep underwater and post sentry ships with searchlights on the surface. Today the barrage claims its first U-boat victim; UB-56 is attempting to transit the Channel by night and submerges when it is caught in searchlights, only to then be sunk by a mine. Its crew of 37 perish in the waters.
map (Naval-History.net: The Dover Patrol)
UB-148, a similar vessel to the UB-56 (Wikipedia)