Despite America's confidence regarding the Caracas foothold, the supporting American fleet, having been under attack from the skies from the German Luftwaffe for many weeks, has suddenly found submarines in their midst, sinking many.
Emboldened by the German U-boats success, an ambitious naval transport captain attempts to grapple with the US destroyers out in the Atlantic near Caracas, and to everyone's surprise sinks the vessel! Granted, it had been weakened by previous attacks, but the Captain's risk-taking has resulted in a formal reprimand, followed by promotion.
GPS on.