The activities included use of the Double Cross System for counter-intelligence and the British (code named) "Big Ben" project to reconstruct and evaluate German missile technology[4] for which Denmark, Poland, Luxembourg, Sweden, and the USSR provided assistance.

The Polish resistance Home Army (Armia Krajowa), which conducted military operations against occupying German forces, was also heavily involved in intelligence work.

[5][6] By the summer of 1941 Home Army intelligence began receiving reports from its field units regarding some kind of secret tests being carried out by the Germans on the island of Usedom in the Baltic Sea.

A special "Bureau" was formed within intelligence group "Lombard", charged with espionage inside the 3rd Reich and the Polish areas incorporated into it after 1939, to investigate the matter and to coordinate future actions.

Then in early March 1944, British Intelligence Headquarters received a report of a Polish Underground worker (code name "Makary") who had crawled up to the Blizna railway line and saw on a flatcar heavily guarded by SS troops "an object which, though covered by a tarpaulin, bore every resemblance to a monstrous torpedo.

On the other hand, the AK did alert the British as to the dangers posed by both missile designs, which led them to allocate more resources to bombing production and launching sites and thus lessened the eventual devastation caused by them.