Signals

The bell system. This is how I communicate with the outside world.

	Postal address
	Graukaue – Podcast-Studio Dr. Michael Holtkamp Fürst-Leopold-Platz 1 46284 Dorsten Germany

	Phone
	+49 2362 7067573

	Mobile phone
	+49 179 5201191

	E-mail
	michael@holtkamp.ruhr

PGP key

On iMessage and FaceTime, I can be reached under the address above.

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	@michamaenneken

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	@michamaenneken@ruhr.social

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	Michael Holtkamp

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Bell

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There’s levels to this pit - Going deeper and deeper with Michael Holtkamp

Under the roof of the Gray Coe there are countless microphones, with each microphone being suspended from the ceiling just like a clothes hook. At the beginning of a shift, each miner lowers his microphone, like the announcer in a boxing ring did in the past. When the bell rings three times, the crew goes down into the mine. Glückauf!