Witts - who plays Joey Branning in the BBC soap - told MSN that the dramatic scenes act as a "slap around the face" for the Albert Square heartbreaker.
"We filmed it a couple of weeks ago in Bristol," he explained. "It was amazing. We had doubles in for all the big stuff, we were there watching from the sidelines when it happened.
"It was absolutely humongous, I think even the director didn't believe how big the explosion was. It was really fun, and fortunately I didn't die, so I've still got a job!
"I think to be quite honest with you, Joey needed that to just slap him around the face. He's been a right git for so long, winding people up, playing around with girls and I think he really needed something to shock him, to show that he does have a vulnerable side."
Witts also praised Jaqueline Jossa - who plays his on-screen cousin Lauren - for her involvement in the explosive scenes.
"She's really great and she's good to work with as well," he said. "She knows her stuff and it's been really enjoyable working with her for the last couple of months, building up the relationship that we're about to have on screen."