What a great stop as you are walking around Bremerhaven. If you have an interest in military…read morehistory, this museum is a great stop. It's affordable, informational, and historical all at the same time. For 3 euros, you will be hard pressed to find as interesting of a stop in Bremerhaven.
When I visited, it was a cool, rainy day and so I was the only person on the submarine. The people working there were friendly and clearly wanted me to enjoy the visit. While my German is not as good as it used to be, and their English was almost zero, they tried to point out as much as possible and I greatly appreciated it.
Make sure you stop at the U-Boot Wilhelm Bauer, former U2540, on your Bremerhaven visit! You can get here by foot, bus or taxi.