Don.
I have checked your last issue of the Skizzenbuch. I guess your assumption that the crew of U 926 deliberately damaged the U boat is not according to fact. In order to understand the cicumstances I shall give you a breafing. Following Hitlers suicide in April 1945 Grossadmiral Karl Dønitz, admiral of the submarines became the new Fuehrer. The situation in Germany was hopeless,but in Norway he had a full war equipped army of 300.000 men plus 87 fully equipped uboats being a considerable threat to the allies. Therefore as late as 4. May 1945 the orders from Befehlshaber der Unterseeboote (BdU )was issued: Norway is the headquarter of the Uboats operational control, the war goes on. It looked as if Dønitz had desperate plans to continue fighting out from Norway. On the continent scuttlings of uboats took place. (Operation rainbow), but not in Norway were everything was in control.
The overstressing of U-926s pressurehull took place early April 1945 and at that time it would be a treason to deliberately destroy an Uboat. A fully functional Naval high command would prosecute the responsible person for such an action with deathpenalty as a consequence for the guilty people involved. No such penalty took place so I guess the high command concluded it was an accident caused by inexeperienced crew and possibly a faulty reliefvalve causing the dammage.
Kindly note U 926 was not a sister uboat to U-995 as U-926 was a VIIC and 995 a VIIC/41.
Tore