Ok, this makes moving the #U505 or #727 to #MSIChicago look easy.

Also, the #U17 was built in 1935. The front: Pepper-box maybe? But that prop looks like it came from the future. Was it used for some development work? Even the retractable bow planes are pretty cool.

https://www.youtube.com/watch?v=8hJruDOPSnY

Submarine Heavy Haulage: U17 Squeezes Through Narrow Streets - Part 3

YouTube