Suddenly his pulse quickens as the high - pitched whistle descends to a guttural clicking noise ​ — a sure sign that his device is above buried metal.
Tiba - tiba jantungnya berdebar sewaktu suara lengkingan itu berubah menjadi bunyi klik rendah ​ —⁠ tanda bahwa alatnya berada di atas logam yang terkubur.