What are these? (2)

[Monter_Trismegistos]

Well, maybe those two on the right would be too hard but concentrate on those on the left...

[RBWhite]

Can't make hide nor hair out of the picture. I'm guessing it is some sort of pressure vessel or compartment.

Not sure if the area is a drydock or large aircraft assembly building.

My second guess is_______________ a watertube for an airship[:D]

Honestly I have no Idea.[&:]

Hint, hint, hint_______________________________________[:)]

[SemperAugustus]

It reminds me a bit of the Type J subs from Japan. But I have really no clue...

[Monter_Trismegistos]

Hint: 3 Submarines, European

[trojan58]

type XXI submarines

[Monter_Trismegistos]

Nope, not German.

[trojan58]

Polish Orzel, O23 and O24 Dutch submarines under construction in Rotterdam,
August 1938.

[RBWhite]

You got it trojan

before

[RBWhite]

After

[Monter_Trismegistos]

You guys are wonderfull!!!!! Respect![&o] Correct!

Orzel (eagle) was a very modern Polish submarine built in Dutch shipyards. There is a very interesting story about his sistership Sep (falcon).

from: http://www.dutchsubmarines.com/export/export_orzel.htm
Sep wasn't completed by the Dutch R.D.M. shipyard. On 10 January 1939 Sep was ready for trials which continued successfully until April. However, in view of the uncertain political situation the Polish Navy was afraid that the Germans would exert pressure on the Dutch in order to prevent the boat from being delivered to Poland, so the prospective commanding officer (Ltz. I Wladyslaw Salamon) was ordered to 'kidnap' the submarine. On April 2nd Sep left Rotterdam for the Oslo fjord where she was to conduct diving tests. On the 16th she arrived in Norway and made a rendezvous with the Polish destroyer Orp Burza. All but two Dutch dockyard workers were put ashore at the Norwegian Navy base in Horten. Sep was commissioned into the Polish Navy and accompanied by Burza the Sep she sailed to Gdynia where she arrived on the 18th of April. The two Dutch engineers were sent back to Holland. The resulting dispute between the Polish Navy and R.D.M. was settled out of court. Poland paid the last instalment and covered travel expenses of the 'abducted' Dutch dockyard workers. In return, the remaining equipment necessary to complete the boat was shipped from Holland. Sep was to return to Rotterdam in the summer of 1939 to complete her shakedown but because the war was imminent the idea was abandoned.

PS. I know about torpedo armament of both ships that they had 4 torpedo tubes forward, 4 torpedo tubes rear, and 2 double rotating torpedo tubes amidship. Anyone have a picture of rotating torpedo tubes on any submarine? I wonder how it would work in practice...