Entry to the Concorde and the other "walk in" Planes was from one direction. To enter, you had pass through a turnstile. Now, to do this, you need to stand on the two feet marked on the platform. For me, it didn't work, I think the reason was there were too many people waiting to enter the Plane, as when I returned 10mins later, did the same thing, the turnstile moved for me.
Just a warning if your coming to the Sinsheim Auto & Technik Museum, YOU WILL NOT FIND BOATS / SHIPS / SUBMARINES etc here.
These are located at the other TECHNIK MUSEUM & SPEYER.
All I can remember seeing at Sinsheim, was this 2 man exploration Submersible.