A huge explosion at a waste company which saw two employees flung in the air has been caught on CCTV . The shocking footage shows the moment the blast takes place then around nine seconds later a massive metal tank comes plummeting back to the ground, as a nearby worker makes a run for it. Tomasz Patek and Robert Tyrko were replacing pipework on the metal tank when sparks from the grinder they were using ignited the gas causing a huge explosion at the environmental waste company in Nottingham.