CHANGE IS THE ONLY THING THAT IS CONSTANT (Herakleitos, 2500 years ago)
I have written earlier (GOOD NEWS  BAD NEWS) about the Russian gas tanker that last August sailed from Stavanger in Norway to a port on the Russian Pacific Ocean coast in 18 days, while in 1878 it took the Finnish-Swedish explorer Nordenskjöld almost two years (since he got stuck in the ice with his steam/sail ship Vega and had to stay over the winter in the ice).
The UK submarine manoeuvre that is shown in the article might not have been possible 10 years ago – the ice was still too thick and the sub probably not equipped  to break the ice from below.
And “the same man cannot twice step down into the same river.”

http://bit.ly/2ppqWwz