I would like to build a bridge from the top of a mountain, out through the air, and connect it to a tower I've built. How can I build a bridge out into space? The bridge will be very high and it's not possible to build it from the ground.
I see this is a pretty old thread, but one answer no one mentioned was to use a water bucket. You can build down from a block in mid-air by creating a water stream on the side of it, and swimming up and down the stream. This allows you to get underneath a block, then return to the top of it.
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