The collection organised by the Submarine Fleet Foundation in May 1933 developed into one of the most successful undertakings among similar events nationwide.

In the course of building and testing two submarines, the Estonian crews got a top-level naval training at the time in England in 1935–1937.

[3] On 30 June 2010 a wreck of what appeared to be a submarine was found five miles north of Cape Juminda, Northern Estonia by the Estonian Maritime Museum research vessel Mare.

According to marine archeologist Vello Mäss, the specific shape of shafts for laying mines on the submarine-shaped object seen on the sonar screen gave rise to hopes indicating a probability of about 95% that the wreck found was the Kalev.

[4] Hopes were high that this sonar target suggested that Kalev had been found and that the presumption that she sank as a result of hitting a mine near Cape Juminda was correct.