Submarine and the heat

Have you ever seen a submarine entering a harbor? Her you can see it twice a day and its somehow a strange view. They even go out when it is rough since in 30m they dont feel waves.
It is expensive, almost 100EUR.

And some people doubt that it is still hot here. See my hot and sweaty face as a proof! It is still 29 Celcius here. Phheewwwww