On the fourth day of the January grand sumo tournament in 1998, during a Makushita (the third highest division in sumo) bout between Otakayama and Yachi, when Yachi's shoulder hit the dohyo, a large hole appeared with a collapsing sound in one corner of the dohyo under the black tassel.
1998年1月場所4日目、幕下取組の鳥羽の大鷹山-谷地戦で、谷地が肩から土俵下に落ちた際、正面黒房寄りの角に近い部分の土がぼこっと崩れて大きな穴が開いてしまった。