Film idea hells gate

the year is 2022 and london is in ruins, 5 years ago something appeared in trafager square and a two mile radias was destroyed. the millatary quarinteened this area as forbidden/ it had been named hells gat, a paraelle dimension, a barrane wasteland with no inherience, when the explosion was over only a handfull of people survived, they were all in comas, but a little while after they all recovered, theses survivors, had all lost something but they had also gained something at the same time.