There's no use peering through the letter-box. The place is as still as the grave. They must have forgotten we were coming.

不用朝投信口里张望了，这里静静的没有一点儿声响，他们准把我们来这里的事忘了。

youdao

But after Christianity was legalized in 313 AD, funerals moved above ground, and by the 5th Century, the use of catacombs as grave sites dwindled, though they were still revered as sacred sites where pilgrims would come to worship.

BBC: Exploring the history of catacombs