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Project MOHO...or Mohole...
KentuckyFriedFloozy · 26-30, F
@KentuckyFriedFloozy It was a project to drill into the Earth deeply enough to reach the Mohorovičić discontinuity (AJA "the Moho"), a transition zone between different densities of the rock/materials in the Earth.

From https://en.m.wikipedia.org/wiki/Mohorovi%C4%8Di%C4%87_discontinuity:

In the early 1960s, Project Mohole was an attempt to drill to the Moho from deep-ocean regions.[14] After initial success in establishing deep-ocean drilling, the project suffered from political and scientific opposition, mismanagement, and cost overruns, and it was cancelled in 1966.[15]

It's one way of looking at the crust-mantle boundary:

Beginning in the 1980s, geologists became aware that the Moho does not always coincide with the crust-mantle boundary defined by composition.

instead

The Moho marks the transition in composition between the Earth's crust and the lithospheric mantle. Immediately above the Moho, the velocities of primary seismic waves (P-waves) are consistent with those through basalt (6.7–7.2 km/s), and below they are similar to those through peridotite or dunite (7.6–8.6 km/s).[5] This increase of approximately 1 km/s corresponds to a distinct change in material as the waves pass through the Earth, and is commonly accepted as the lower limit of the Earth's crust.[2] The Moho is characterized by a transition zone of up to 500 meters.[6]
Thank you, @KentuckyFriedFloozy; that was from 8th grade science class. lol
I'm serious, @KentuckyFriedFloozy! I immediately thought of that.