Emma writes, I took this eerie photo on my phone at Hull's £53million attraction The Deep. Boffins at the aquarium admit they are baffled by the appearance of the man's face, which appears to be gawping up at a shark.

I only spotted the ghoulish face when I arrived home. My boyfriend said, 'what's that?' I replied, 'it's a shark'. "He said, 'no, the face.' I was like, oh my Gosh! It actually looks quite spooky. "I'm easily freaked-out." Although my dad, 48, was standing next to me in the glass tunnel, he looks nothing like the man in the photo. Bosses have spent hours searching CCTV footage, which confirmed the the two of us were the only ones inside the tunnel. And they have even tried to recreate conditions in the tunnel where the reflection could appear, but with no success.

The aquarium - on the banks of the Humber estuary - was built on the site of an isolation hospital, where smallpox victims were held. It's not the first time ghostly goings-on have been reported. A night watchman claims to have spotted a shadowy figure in the TimeLine, which charts the history of the world's oceans. Colin Brown, chief executive of The Deep, said: "We are a scientific centre and we're sure there must be a logical explanation. "It's just that we can't find it."