What is the word that shares meaning with "mausoleum" but sounds like 'chartomb' (/tʃaːtuːm/)?

Example sentence:

In 1984 the Long Island Lighting Company (LILCO) successfully constructed a General Electric nuclear boiling water reactor about 60 miles east of New York City. However, before the power-on testing would begin, an oil-financed, anti-nuclear, pro-solar power campaign had swept through the small town of Shoreham, NY, where the plant was located, eventually mobilizing the locals to successfully prevent LILCO from ever doing any start-up tests at all, and ultimately winning the legal battle for the power station's decommissioning.

Today the site, complete and intact, is frozen in time as a non-living museum of sorts, in its 25th year of neglect. This [chartomb] is as an empty a vessel as the promise it once held: to displace 3 million tons of carbon dioxide each year. Neighbored by gas and wind-turbines taking advantage of its grid infrastructure, it stands sentry over the area, now as CO2 contributor.

The word in the brackets shares a similar meaning with mausoleum or sarcophagus. It's expansive and sprawling, but barren and left to the elements.

IPA transcription: /tʃaːtuːm/

You're looking for catacomb

/kætəkuːm/ or /katəkəʊm/
1. n. (usually catacombs) An underground cemetery consisting of a subterranean gallery with recesses for tombs, as constructed by the ancient Romans.

1.1 n. An underground construction resembling or compared to catacombs.

Definition 1.1 is the correct definition in this context.

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