More than 13,000 people would be killed in Hartlepool if a hydrogen bomb hit the town, a computer programme has predicted.
As North Korean officials claim that an underground hydrogen bomb test has been carried out in the country, we take a look at the impact a similar device would have in the unlikely event of it being detonated in Hartlepool.
Computer programme Nukemap has estimated that 13,770 people would be killed in and around the town - while more than 20,000 would be injured.
Casualties could suffer third degree burns, and be affected by radiation.
These figures are for a 10 kiloton bomb - the yield which North Korea claims to have tested in a hydrogen device.
Nukemap's results also show that the air blast radius would reach as up to 0.99 kilometres, stretching across the marina and towards the town's football ground.
Concrete buildings would be forced into collapse in these areas, and the fatalities would be widespread.
The radiation would have a radius of almost five kilometres squared - and if medical treatment is not provided, between 50 and 90% of people would die.
Dying could take any time from several hours to several weeks.
People more than six kilometres away would suffer third degree burns. This would affect Middleton, Hartlfields and The Headland.