Commander Steven Drysdale misread a submerged hill's depth on navigational charts, thinking it was at 723 meters instead of the actual 132 meters. -He ordered the submarine to dive to 250 meters ...

Below is an infographic by St. Petersburg, Russia-based designer Anton Egorov depicting the submarines that Russia currently operates, along with their maximum depth: Russia's submarine fleet is ...

Both nations are aggressively seeking to expand their projected maritime power in the region, especially through the use of submarines. The following Reuters chart compares their submarine fleets.