looking good! Your hermanns is a real lucky tort to have such a spacious hide/enclosure.Tortoise Cave version 2.0
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They didn't have any slate at the store but they did have some nice sandstone stepping stones that match better than slate would, and I found three that almost fit together like puzzle pieces so I bought them to use as the roof of the cave, and extended the hole some more to accommodate the full length of the three stones. The tunnel entrance is just a bit over 7 inches wide now, and the widest point at the back is about 10 inches wide. It might be better to have it bigger, but that's as big as it can go and still have the roof piece fit securely over the brick walls. The front edge of the ceiling to the inside of the back wall is just a bit under 30 inches. The whole thing front to back is right around 6 inches high from the floor to the ceiling. I might dig down to round out the floor a bit in the back cave to make it slightly taller, but that should be plenty of room for him to stand up with his legs fully extended.
I do have enough bricks to extend the tunnel the length of one more set of bricks, but then the roof wouldn't fit and I'd have to find something to use to finish off that additional section of roof. I think 30 inches back is probably enough for a Hermann's Tortoise, but I'm welcome to input if you think it needs to be deeper.