| 1 | So first, we have to look at the bottom. | |
| 2 | "A box has a top, a bottom and four sides. " | |
| 3 | Both bubble types have a floor diameter of about 4 meters (13 feet). | |
| 4 | So, it's something that has a bottom face, and a top face, and then some vertical sides. | |
| 5 | It was a sheer drop of ten or twenty metres, with boulders at the bottom. |
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