This is probably the greatest weakness in Taiwan's naval defenses. Professor Chung points out that during the ROC's Hankuang maneuvers in 1994, a PRC submarine was detected off of Makung, in Penghu. But one ROC sub was at Tsoying for re-supply, and the other was in dry dock for its scheduled overhaul. (A submarine requires a nine-month overhaul in every 45-month period of service).
鍾堅教授指出，八十三年五月漢光演習，我海軍在澎湖馬公偵測到疑似中共潛艦，但是當時我兩艘潛艦，一在船塢大修（通常艦艇的使用周期是每四十五個月，要有九個月在船塢大修，才能保持妥善狀態），一在左營整補。