Hi Alessandro,
Those pictures are from the website
http://www.oldcmp.net/ns1.html
where more of such pics can be found.
To be more precise about the location: The 1st and 3rd picture are made during the Strike at 25th September 1944 between Den Helder and Texel (the Netherlands).
The first picture is also the most dramatic one. The big splash in front of the armed trawler (Vorpostenboot) is from the crash of Beaufighter NT987 UB-W of 455 Squadron. The crew, F/O C. E. A. Cock DFC and W/O A. R. Lyneham, lost their lives.
Regards,
Hans Nauta