In 1992, stone walls were found on the north slope of Sakefuneishi that are presumed to be the remains corresponding to the construction which was mentioned in Nihonshoki (the Chronicles of Japan) during the era of Emperor Saimei.
平成4年（1992年）に酒船石の北の斜面で石垣が発見され、日本書紀の斉明天皇の時代に記述される工事に該当する遺跡と推測されている。