‘Quick! Block the entrance with those boxes! It’s our only chance!’

We rushed to the pile of boxes, grabbed one apiece, staggered with them to the entrance, dumped them and jumped back for two more. We had the first row in place when we smelt the rats.

There was something blood-curdling and ghastly in the smell that drifted into the cave as the pattering feet came rushing down the long length of the tunnel.

‘As fast as you can.’

I grabbed hold of two boxes, dragged them across the floor, swung them into place. As Paula ran back for another box, I turned the beam of the torch into the outside tunnel. The sight that met my eyes sent a chill up my spine.

The whole of the narrow floor of the tunnel was carpeted by a heaving mass of brown, furry bodies. The sound of their shrill squeaking, the rustling tails and pattering feet made a nightmare sound of horror.

I snatched out the .25 and fired twice into the seething mass. The crash of gunfire rolled down the tunnel, deafening me, and setting up echo upon echo.

The awful brown carpet swerved, but there was no room for them to retreat. Swarms of rats, stretching the length of the tunnel, prevented those in front from getting away.

The two bullets had brought down three of the monsters, and the rest of them flew at the bodies, piling one on the other, their razor-like teeth slashing and hacking while the air was filled with their horrible, piercing squeals.

I grabbed a box from Paula and set it in place, rushed back and dragged two more across the floor and heaved them up.