As the MIT explained it three decades back, the job sought”to turn the entire world to a large radio telescope dish.”

Since astronomical signals reach the radio telescopes at slightly different rates, the investigators needed to figure out how to account for visual information could be extracted and this so calculations could be accurate.
As MIT explained:

Bouman embraced a smart solution to this problem: If the measurements from three telescopes are slowed, the delays brought on by sound cancel each other out. The increase in precision constitutes the loss of data, although this can mean that every new dimension requires data from three telescopes, not two.

So much information was gathered by Event Horizon Telescope that it had to be shipped on a great deal of drives to the MIT Haystack Observatory.