There's some interesting midget U-boat stuff at the URL below.
The bad news is that this site is in German.
The good news is that you can get an automatic translation into English by going through Google.
Go to Google.com
Key in search words
"Der nasse Tod" 8 April 1945
Click onto Google search.
Go to the reference with the URL given above.
Click onto "[Translate this page]"
Check out this site and click onto the highlighted/underlined words.
Interesting stuff and some photos I've not seen elsewhere.
Incidently, Der nasse Tod means The Wet Death (death by drowning).