"The structure---dated to the 8th and 9th centuries---is a monolith cave temple carved out from a single, rectangular granite rock measuring 7.5 m (25 ft) in depth. The granite rock looks like a blooming lotus with rocky hills surrounding it from three sides."
https://www.ancientpages.com/2021/05/25/vettuvan-koil-temple-spectacular-monolith-dedicated-to-lord-shiva-and-built-by-pandya-dynasty/