 It was later discovered that these torpedoes were unreliable when fired from a submerged sub because the increased water pressure caused the seals of the torpedo detonators to fail.For this reason a report that the Finns received from the besieged Hanko that a Soviet freighter had arrived there with two Finnish torpedoes sticking out from its hull became more believable.On 30 November "Vetehinen" sortied to intercept a convoy but was unable to reach it.