Sometimes the form of unidentified flying objects is far from the usual classical forms known from the ufological literature. So, one such object, shaped like a smoking pipe, was seen as a constant "observer" during the test of a secret Soviet aircraft with a jet engine Bi-1 in 1943. Here is what the famous Russian ufologist V. Azhazha tells about the course of these tests in his book "Beware: flying saucers!":
As you can see, the strange unidentified object in the form of a smoking pipe was interested in testing secret German and Soviet aircraft with a jet engine, which were at that time the most advanced aviation technology. What kind of "controllers" used this object to control the level of development of jet aircraft in our civilization? Were they time travelers or aliens from other planets or worlds, or maybe they were representatives of an underground (underwater) civilization, which E. Snowden told about based on the secret files of the CIA and NSA stolen by him? We can only guess for now.