ORP Orzeł, a Polish WWII-era submarine.

The original version was drawn in svg by Halibutt, and was based on the original version by Ariane Schmidt
After some time I dumped the original design and modified an svg version by Ysangkok (which in turn was partially based on my previous version of this image; I know it sounds complicated). The new version is basically Ysangkok's image with all colours changed to black.

I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.