The Standard took to the murky waters of the Thames in an effort to hunt for a mysterious 'creature' that was apparently swimming in the river.
Shaky footage which emerged this week had Londoners and the internet baffled.
River boat tour operators say they have been swamped with requests from eager monster hunters keen to catch a glimpse of the ‘beast’.
So Standard online caught up with tour firm Thames Rockets for a trip on a boat to try and track down the elusive thing, whatever it might be.
Head guide Mike Cole said: "I'm keeping my eyes out as we speak to be honest with you.
"I'm worried it's going to come up on to the deck and pull me in the water.
"We're all keen eyed and ready to spot it.
"They (tourists) aren't listening to a word we're saying - they are looking out over the water trying to spot the next sighting.
"It's the strangest thing in many years to have been seen on the Thames."
There has been wild speculation as to what the object might be.
One person posted online: “If you slow it down enough and pause it, kind of looks like a pod of dolphins or porpoises."
Last year, the Standard reported that more than 2,000 seals and 450 porpoises and dolphins have been spotted in the Thames over a decade.
