Translation of "Rumbles" in Japanese

The rumbles are their secret code.

‎低い音は秘密の暗号だ

Deep rumbles roll through the jungles of Borneo.

‎ボルネオ島の密林に ‎低い音が響き渡る

Using low-frequency rumbles, some so low, they’re inaudible to humans,

‎ゾウは人間には聞こえない ‎低周波の音で交信する