A massive 30 mm calibre round was found in the Clyde in Renfrew by a fisherman. 

Terry Smith shared his story with the Glasgow Times after the interesting finds made by magnet fishers has highlighted what could be hiding in the depths of Glasgow waterways. 

He explained he did not immediately realise how dangerous the find could be when he made the discovery in 2018.

He told the Glasgow Times: "I had to take advice off my friend who was in the military. At first, he thought I was winding him up."

READ MORE: Meet the Glasgow fishers pulling out 'potential murder weapons' from waterways around the city

After sending his friend a picture of the round next to his hand, the man informed Terry the bullet was "very dangerous". 

Glasgow Times: (Image: Terry Smith)(Image: Terry Smith)

Terry added: "As soon as he realised I wasn’t joking he told me to hang up and call the police, he told me the bullet was very dangerous.

"It was a 30 cal anti-aircraft bullet used for piercing armour."

Officers were raced to the scene to ensure the ammunition, thought to be live, was made safe. 

Glasgow Times: (Image: Terry Smith)(Image: Terry Smith)

He added officers were "worried about the bullet because they hadn’t seen anything like it". 

If live the 30 mm calibre round could be highly combustible. 

The massive rounds can come in two other varieties other than armour-piercing, including high-explosive and training rounds.  

We previously reported a cache of weapons has been pulled out of a canal in the north of city by a group of magnet fishers. 

Founding member of  Glasgow Magnet Fishing Mark McGeachin revealed past "treasures" have included a military issue machete from the 1940s and antique sabre sword from the 1700s.