So the signalling system says that there's no boat.

所以信号系统说没有船。

So we had this mystery to kind of understand, you know, signalling system does not show a boat there.

所以我们有了这个谜团来了解，你知道，信号系统没有显示那里有船。

So we started using this signalling system to track the historic movements of a ship called the Pawell.

所以我们开始使用这个信号系统来跟踪一艘名为 Pawell 的船的历史运动。

This kind of signalling system called the AIS — boats use this to make sure that their location is constantly known.

这种称为 AIS 的信号系统——船只使用它来确保它们的位置始终为人所知。

This boat sits about a day's travel away from the occupied port in question and it switches off its signalling system suddenly.

这艘船离被占领的港口大约一天的路程，它突然关闭了信号系统。

So after a long time of it sort of loitering off the coast of this port of Samsun in northern Turkey, you know, switching its signalling system on and then off and then on again and then off again.

因此，在它在土耳其北部萨姆松港的海岸附近徘徊了很长时间之后，你知道，它的信号系统打开然后关闭，然后再打开然后再关闭。