5 Years in prison because you're stubborn? Wow!
To be honest, there should be some limits on how long a judge can hold you in contempt to avoid them abusing their power by taking defendant actions as personal.
Was the story from when he disappeared.
The story echos your friend's concern. Wreck divers will remove anything they can from these sunken vessels; placards, insignia, gauges, etc. They will also damage the vessel in order to make room to continue exploring.
The German government was also not happy with the book's protagonists because they deem sunken vessels as graves and believe they should remain undisturbed.