I read from commonwealth to commune.

Here is the official lyric video for "Oliver Cromwell" from Monty Python which is not about Charles I, but actually about Oliver Cromwell.  Odd. 

https://youtu.be/dBPf6P332uM

In case you were also curious, the Mariana Trench is over 36,000 feet (almost 11,000 meters) below sea level. 

https://en.wikipedia.org/wiki/Mariana_Trench

The word of the episode is "commune".

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