<prompt> Translate the following text to EnglishMchoro huo uliotengenezwa kwa jiwe moja jeusi na kuwekwa ndani ya tangi la maji lililozama, una urefu wa mita tano na unatokana na karne ya saba.  <response>: Carved from one black stone and set in a sunken tank of water, the 5-m 16-ft image dates from the seventh century. 