They would only know that there was some sort of floor/shelf at the location of the dive. Maybe 5 meters away, there is a huge drop off. Zacaton is about 120 meters in diameter at the surface, so we are talking about quite a large cross sectional area.
Of course, it turns out that it looks like there is a flat, sloped floor at the bottom, but there is still a tantalizing unmapped corner that may lead to deeper caverns.
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They would only know that there was some sort of floor/shelf at the location of the dive. Maybe 5 meters away, there is a huge drop off. Zacaton is about 120 meters in diameter at the surface, so we are talking about quite a large cross sectional area.
Of course, it turns out that it looks like there is a flat, sloped floor at the bottom, but there is still a tantalizing unmapped corner that may lead to deeper caverns.