The cavern was created by volcanic forces that generated a lava tube, along a series of lava flows near the coast. It is approximately 69 metres (226 ft) long, 4.7 metres (15 ft) tall and 3.9 metres (13 ft) wide.[1]
References
^Inventário do Património Espeleológico dos Açores (in Portuguese), Angra do Heroísmo (Azores), Portugal: GESPEA-Grupo de Trabalho para o Estudo do Património Espeleológico dos Açores, archived from the original on 30 November 2012, retrieved 3 December 2009