<p>Russian T-54 tank, used by Finland.  This model was cut open in for training purposes. Various systems of the tank have been illustrated with different colors.
This view shows the front armour, partly cut away to illustrate its thickness.
Finnish Tank Museum (Panssarimuseo) in Parola.
Photo taken on July 14, <a href="//commons.wikimedia.org/wiki/2006" title="2006">2006</a>.
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Source: Photo by me, <a href="//commons.wikimedia.org/w/index.php?title=User:Balcer&amp;action=edit&amp;redlink=1" class="new" title="User:Balcer (page does not exist)">User:Balcer</a>.
<a href="//commons.wikimedia.org/wiki/User:Balcer~commonswiki" title="User:Balcer~commonswiki">Balcer~commonswiki</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>