You have this loop of water (or some other "incompressible" fluid) with a nuclear powered water pump that constantly pumps the water in a circle. This loop is slowly lowered near the event horizon of a black hole, lets even make it a super duper massive black hole to minimize tidal effects, it's "slowly lowered" so we don't have a super fast moving loop of water, and my pump is nuclear powered so it can pump against massive head pressure :) So what happens when part of the loop crosses the event horizon? Specifically what does the fluid do? Now obviously the fluid can't get pumped back out past the event horizon, and in an ideal case fluid wouldn't be pumped into the now missing part of the loop because the fluid would occupy that space and there'd be no way to put more in there... however since it's within the event horizon no information about there being fluid can make it back outside, so how would the fluid outside of the event horizon "know" that it can't go into that other section of pipe. I know that it would be pulled into the SMBH eventually, but what happens to the fluid which the pump is trying to move through the loop. Reason for question: I was watching Stargate and was thinking about this and all these shows that have this "portals" to move you from one location to the next, more specifically that these portals are one way only (yeah you can go both ways in Stargate but you have to reopen it from the other side IIRC). So I started wondering about how that would affect the physiology of life going through these one way portals, now it's glossed over as "fictional" but still had me wondering, blood is pumped in different directions in the body, nerve endings send electrical signals in different directions too, and blood (or electrical signals) pumped "forward" in your body wouldn't be able to come "back" until you completely went through said portal. So rather than come up with this question, I simplified using the only one-way portal I know of (event horizon) and used a loop of fluid.