Upon undulate
uncanny ultramarine
Unfathomable
Written as part of a series of Alphabet Haiku
To understand this one, you have to read it in the context of the title.
undulate = (used as an adj.) having a wavy surface or edge
uncanny = strange or mysterious, esp. in an unsettling way
ultramarine = (used as a noun, representing the ocean) a brilliant deep blue color
unfathomable = incapable of being fully explored or understood; impossible to measure the extent of
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Dark Side of the Moon 
And fathom is a unit used to measure depth. Deep. : )
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🙂 Thank you
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