Russia’s military investigation department is in the final stages of closing the case on the theft of two 13 ton propellers from the Bespokoynyy a guided-missile destroyer.

The Sovremenny class destroyer was in dry dock, in Kaliningrad, according to The Drive. Kaliningrad is the heavily militarized Russian territory located between Poland and Lithuania and separated from Russia’s mainland. Kaliningrad is also home to Russia’s Baltic fleet.

The Bespokoynyy was being converted to a floating museum at the time of the incident.

Allegedly, a former commander of the ship was the ring leader in the plot to steal the bronze propellers. The motivation was financial. According to the Russian news outlet Interfax, the leader of the investigation department, Sergei Sharshavykh, confirmed the two propellers were worth around 39 million rubles, equating to about $523,000.