Unknown monster filmed in Lough Foyle in Ireland (video)

Was shooting in Lough Foyle when this thing went past us. It was massive. Really don't know what it was. 

There have been whales in the Lough before so maybe that's what it was but Matthew was closer than we were and says it was no whale. 

Looks like we have our own Loch Ness Monster?! 

Any experts out there ?

We're still filming so if it shows up again we'll do our best to get a better shot of it.

Our film's called 'Fishing with David Lynch', which was why I was wearing the suit (a David Lynch costume.)

 Source: Youtube