 A second operation was planned for 10 May using the cruiser HMS <unk> and proved more successful , but ultimately it also failed to completely close off Bruges . A third planned operation was never conducted as it rapidly became clear that the new channel carved at Zeebrugge was enough to allow access for U @-@ boats , thus calling for an even larger double assault , which would stretch the resources of the " Allied Naval and Marine Forces " too far . British losses in the three futile attempts to close Bruges cost over 600 casualties and the loss of several ships but Bruges would remain an active raiding base for the German Navy until October 1918 . 
