The Russian naval tradition

I'm sorry, but I can't help pointing out this passage from the Wikipedia article on The Battle of Port Arthur:

"On 11 February 1904, the Russian minelayer Yeneisei started to mine the entrance to Port Arthur. One of the mines washed up against the ship's rudder, exploded and caused the ship to sink, with loss of 120 of the ship's complement of 200. The Yeneisei also sank with the only map indicating the position of the mines. The Boyarin, sent to investigate the accident, also struck a mine and was abandoned, although staying afloat. It sank two days later after hitting a second mine."