They kept it in underground tanks.

通常贮藏在地下储存罐中。

From Japan: Results gathered from the Kamioka Observatory, which includes an underground detector tank filled with 55,000 tons of water,suggest an intriguing discrepancy in how neutrinos and antineutrinos oscillate, potentially violating symmetry between matter and antimatter.

来自日本：从神冈天文台收集的结果，其中包括一个装满 55, 000 吨水的地下探测器水箱， 表明中微子和反中微子振荡的方式存在有趣的差异，可能会破坏物质和反物质之间的对称性。