Principal drawing of a <a href="https://en.wikipedia.org/wiki/Diving_bell" class="extiw" title="en:Diving bell">diving bell</a>
<a href="//commons.wikimedia.org/wiki/User:Heb" title="User:Heb">heb</a>@<a href="//commons.wikimedia.org/wiki/Main_Page" title="Main Page">Wikimedia Commons</a> (<a href="//commons.wikimedia.org/wiki/Special:EmailUser/Heb" title="Special:EmailUser/Heb">mail</a>)
CC BY-SA 2.5
<span class="int-own-work" lang="en">Own work</span>