Exceptionally difficult. Russian ships probably have active sonar running around the clock which would injury any diver that tried, detect any submerged delivery systems, but more annoying is that salt water disrupts signals. An underwater drone would have to be complex enough to carry out a mission automously at some point.
ohnoTHATguy123 t1_jeg8zd5 wrote
Reply to comment by SignificantDetail822 in Southern Command: Explosions in Crimean Dzhankoi hinder Russia's transfer of weapons. by Rifletree
Exceptionally difficult. Russian ships probably have active sonar running around the clock which would injury any diver that tried, detect any submerged delivery systems, but more annoying is that salt water disrupts signals. An underwater drone would have to be complex enough to carry out a mission automously at some point.