Rules:
*You can teleport into and out of it at will
*It has a couple of plug sockets and can connect to internet from the region you teleported in from
*You can take objects and people with you
*As already stated, it is (3m)^3 (3m*3m*3m). The walls are plain plaster with a light in the middle of the ceiling. The pocket dimension is topologically toroidal, so if there weren’t walls and a ceiling/floor (which you can actually destroy) you would loop if you went more than 3m in any direction. Gravity, then, is artificial and can be altered to anywhere from 0 to 2g from a dial on the wall.
Edit: additional specifications
*You can only teleport out to where you teleported in from.
*Time proceeds at the same rate inside the pocket dimension
*There is an eject button for those inside to get out if something happens to you
You can’t pull things out of the pocket without going in there first, which would be deadly in your situation. (OP says you can go in and out, and you can take things with you.)
In this case, when i die; the button will immeadiately get summoned inside the box only to be presssed an instant later
How would it be pressed? Wouldn’t anything entering the box at that point be akin to pushing a toothpick into a sanding belt?