The only thing that had interested us in the ugly stone was a little pit on to P of it，which was filled with water on rainy days.

稍稍能安慰我们的，是在那石上有一个不大不小的坑凹儿，雨天就盛满了水。

youdao

The children apparently were trying to retrieve a small "child-like pickaxe" at the bottom of the sloped pit when the dirt wall collapsed on them before 6 p.m.

CNN: Searchers find bodies of children buried by wall of dirt