The Ingress. Apparently it's some kind of interdimensional portal device that can pull things into this dimension, but it can't send them back. I wouldn't completely discount the idea of the captains lying, but I can confirm that the device does have a tendency to take belongings from those who it pulls through.
Such a device should be simple enough. Do you have any particular specifications for its construction aside from the general function you wish for it to perform?
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Such a device should be simple enough. Do you have any particular specifications for its construction aside from the general function you wish for it to perform?