Old Finnish submarine Vesikko, summer photo from sea.
<a href="//commons.wikimedia.org/w/index.php?title=User:Pekka_J%C3%A4rvel%C3%A4inen&amp;action=edit&amp;redlink=1" class="new" title="User:Pekka Järveläinen (page does not exist)">Pekka Järveläinen</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>