[1] The site is located at present-day Naval Base Guam’s Ordnance Annex in Sånta Rita-Sumai.
[2][3] Residents from Agat and Sumay were rounded up by Japanese forces on July 19, 1944, two days before the island's liberation.
[3] When the American forces began bombardment and shelling, the Chamorros fled to area of present-day Fena Lake and were herded by the Japanese soldiers into the Atdutgan caves.
[7][8] More than 30 Chamorro victims were killed by grenades, machine guns, bayonets, and sharpened bamboo lances in the caves.
[8] Participants walk to the foothills of Fena Cave, lay wreaths on a memorial at the Old Agat Cemetery, light candles, read the names of the deceased, and perform a CHamoru blessing.