Fire fighters giving a practical demonstration, putting rebreathers (oxygen cylinders and masks equipment) on visitors who would then pass though a long tent filled with dense smoke.    Photo taken on Tűzoltónap (festival honoring firefighters held every year in the spring, formerly around Saint George's feast day) in the Budapest City Park, 2013.
<a href="//commons.wikimedia.org/wiki/User:B_jonas" title="User:B jonas">B jonas</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>