This paper presents the outcomes of sidescan sonar and archaeological diving surveys in 2015 of two wrecked vessels located off Flotta Island, Orkney, North Scotland. Archival research indicates these are the remains of Anti-Torpedo Close Protection Pontoons (ATCPP), an experimental protection device used for close protection of naval vessels at anchor in Scapa Flow from attack by aircraft-launch torpedoes. The pontoons were only in operation in Scapa Flow for 13 months (March 1941-April 1942) and few were brought into service. As such they represent a rare heritage resource, for which very little is known about their operation.

中文翻译：

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第二次世界大战反鱼雷近距保护浮船在奥卡尼州斯卡帕流中的考古评估

本文介绍了2015年对北苏格兰奥克尼郡弗洛塔岛附近两艘失事船只进行侧扫声纳和考古潜水调查的结果。档案研究表明，这些是反鱼雷近距离保护浮筒（ATCPP）的遗骸，这是一种实验性保护装置，用于近距离保护Scapa Flow锚点中的海军舰艇免受飞机发射的鱼雷的攻击。浮船仅在斯卡帕流域运行了13个月（1941年3月至1942年4月），几乎没有投入使用。因此，它们是一种稀有的遗产资源，对其运作知之甚少。