The Russians did it.

Or maybe Nessie? Bigfoot can’t swim. Can he?

A massive environmental monitoring station off Germany’s Baltic coast has disappeared from the seabed, baffling police and researchers.

The seabed “observatory”, worth about €300,000 (£270,000), weighed more than half a tonne. It could not have been dragged off by a storm, tide or large animal, German experts say.

Divers only found a torn power cable at the site, 22m (72ft) down and 1.8km (1.2 miles) offshore.

It is a prohibited area, north of Kiel.

No boats – not even local fishing boats – are allowed into the area, called Eckernförde Bay, about 70km (44 miles) south of the Danish border..

The missing observatory, installed in late 2016, stopped sending data on 21 August.