<prompt> Translate the following text to EnglishPango hilo lenye urefu wa mita 54 na urefu wa mita 15 na upana wa mita 30 linaaminika kuwa lilikuwa nymphaeum, aina ya boudoir ya maji ya Tiberius, ambaye alirudi Capri katika karne ya kwanza baada ya Kristo na kujenga nyumba ya kifahari juu yake.  <response>: The cave, 54 m 177 ft long, 15 m 49 ft high, and 30 m 98 ft wide, is believed because of the man-made niches to have been a nymphaeum, a kind of watery boudoir for the Emperor Tiberius, who retired to Capri in the first century a.d. and built a villa directly above. 