They note that without more communication and active confidence-building measures by all sides, increased naval activity in the area raises the risk of wider hostilities.

他们指出，如果没有更多的沟通，以及各方努力建立互信的措施，该地区不断增加的海军活动，将提升引发更广泛敌对行动的风险。

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"Piggy-backing on a large U-boat, the Seehund had the capability of reaching the Foyle where there was intense naval and merchant navy activity, " he said.

BBC: Experts to examine River Foyle, Derry, wreck