https://sputniknews.com/military/201702101050536120-uk-submarines-nonoperational/
https://blogs.scientificamerican.com/anecdotes-from-the-archive/an-inside-look-at-a-propaganda-submarine-1917/
http://www.telegraph.co.uk/news/2017/02/10/britains-entire-fleet-attack-submarines-action/
http://nationalinterest.org/blog/the-buzz/russia-built-the-largest-most-terrifying-submarine-ever-19353
http://thediplomat.com/2017/02/indian-navy-practices-sinking-chinese-subs-in-largest-ever-military-exercise/
http://www.timesofisrael.com/criminal-investigation-opened-over-submarines-affair-report/