You see the gap on the bottom left in between the 2 triangle foundations? The floor piece above that can be spear raided. When you place a floor piece, the bottom of it is soft side. People should just sit patiently making wood spears and poking that floor with it. I think it would take about 23 wooden spears, and they'd be in.

3NRAG3, When this was created there was no cover. To be honest, I don't even know what that means.

uncovered floor bottom can be spear raided, make sure they are covered