Laws said: “They’re [students] laying down with blankets over them, their eyes are closed. It’s very dark in there. I just had candles and little tea lights lit the whole room, and I was just walking around playing my drum. I had a nice floaty top on with large bell sleeves.”

“A couple with some dogs just came up to the window and were having a look in, but they walked off really quickly and I didn’t think anything of it.”

“I didn’t know until after we left that these people phoned in saying that there was a mass murderer; they were wearing a robe and they were walking over all of the people, and it looked like some kind of ritual, and that the people on the floor were actually dead.

“I guess from the outside view it could look like that, because they’re all really still, very nice and relaxed.

“I’m sure their imagination was running wild with what was going on.”

A spokesperson for Lincolnshire Police said: “A call was made following concerns for the occupants of the North Sea Observatory, at Chapel St Leonards.

“Officers attended, we’re happy to report everyone was safe and well.”