I am pretty sure it’s just an effect of the photos’ perspective, but it looks like there are stairs on the far side, leading out of the enclosure: Tortoises can climb by pushing themselves up! Keep that in mind when adding more interior to the enclosure. We had to pick up my mother’s tortoises at our neighbours quite a few time.
… and there was that one time when a neighbour “returned” a tortoise which wasn’t my mothers.
Not everything that glitters is (Nazi) gold. /s