His friends could have dropped several sandbags to divert water away from the entrance to the hole a) before he entered it, and b) while he was in there, as the camera quickly panned elsewhere.
In this context "recreate" is an awkward term to use in the title - implies "reproduce". Consider switch to "repair" or similar. Delete this comment from a grammar nazi after reading. :-)
Yes, I certainly believe that a man who ran a business selling forged artworks actually buried a valuable treasure which has been found by someone "back East."
Interesting. Thanks for posting this.