When I mentioned the following fact in another article, it proved surprisingly controversial to some commenters, but I'll repeat it here because it's true: Modern subs don't usually use propellers like this (too loud). Many modern subs use pump-jets instead.
So this is pretty fascinating, and rather logical in hindsight. Most minesweeping ships are made largely of wood. This makes them less likely to attract magnetic mines (obviously) and apparently wood is less vulnerable to explosions. Axes are another story.
The challenge in converting subs to museums is where to enter. Health and safety agencies aren't big fans of ladders in public spaces, so most subs cut into the side or build ramps and stairs into the top.
This was a lucky two-second moment when there was no one on the bridge. Two periscopes and all the dials, knobs, and screens you could want. I didn't get a good photo of it, but to the right was a chart table.