[Herrin]

For anyone interested in things like this, I'd recommend "Deep Time" by Gregory Benford[1]. It has a chapter devoted to WIPP[2] and this messaging.

[1] Amazon link: https://www.amazon.com/Deep-Time-Humanity-Communicates-Mille...

[2] Seems to be online, albeit poorly formatted, here: https://www.physics.uci.edu/~silverma/benford.html