The shelters were dug into the soft limestone hill from 1941 onwards and now extend over five hundred metres of passages, rooms, and chapels — including hand-cut alcoves where families lived, a small kitchen, latrines, and the makeshift maternity. The entrance is at street level just west of the parish church.
The tour is self-guided with good interpretation panels and takes about thirty minutes. It is cool year-round (good in summer) but the passages are narrow and uneven — sensible shoes are essential, and people who do not like enclosed spaces should think twice. Combine with the rock-cut sanctuary and parish church above for a half-day on Mellieha's hill.