A partisan movement, with a strength of 300, was active in the Odessa catacombs all throughout the occupation. It managed to organize an excellent communication with the partisan headquarters in Moscow. Antonescu was advised to use poisonous gas to clear the catacombs, but, afraid of the public implications of such an act, decided to abstain from it. Eventually, Romanians were able to inflict a high number of casualties on the partisans with the help of some partisans who switched sides and revealed the movement through the catacombs. Yet, the catacombs were never completely cleared, and the partisans maintained a continuous resistance movement until the return of the Red Army.