Increase in #Russian Submarine Activity of 22 May 2018 http://www.hisutton.com/Russian_Submarine_Activity.html
"There have been reports that Russian submarine activity has returned to Cold War levels. This article uses publicly available data to compare recent activity to Cold War levels...." See WHOLE CORVERT SHORES ARTICLE
What trends do you see in the Table (eg. more than 200 SSKs in 1980)?