A similar process is used for investigating insidious elements. Researchers check for pollutants such as trash and sediment in a five-meter band on either side of the line. They also look for human interference evidenced by anchors, nets, and blast fishing.
至於破壞因子調查，則是紀錄 5 公尺帶狀範圍內，各類污染（如沉積物、垃圾等）和人為破壞（如錨定、炸魚、魚網等）的現況。