Things that bother me about "Iron Coffins"

[The Duck]

Hello all.
New to this site.
Just been reading the comments on "Iron Coffins".
I thought it an interesting book but am now slightly disillusioned, hey ho what's real these days?
"The Longest Patrol" is also a good read.
I realise I've be following an old thread here so let's get up to date.

My interest is in one boat only: U-953.
My uncle Hans Harder was a crew member of this boat.
I have been trying to gather information about Hans and the boat for some time now.
Any pictures, details history, whatever would be very welcome.

History from my point that may be useful to followers here is as follows.

Hans was Born in Neuminster Germany on the 2nd May 1922.
Following the surrender of the boat, he was taken to Huyton, Liverpool to a POW camp. There he met my mothers' sister, they married and Hans stayed in Liverpool after hostilities ceased.
He worked first of all down the mines in the St Helens area and eventually ended up working for Fords Halewood.
My own father died when I was six and Hans became a "second" father to me and my two brothers. Hence my belated interest in his past.
Sadly Hans died a number of years ago so I'm not able to get any direct information.
I look forward to hearing from anyone with any information.
Thanks in advance.
The Duck