From DVIDS by Jeremy Buddemeier.
Life has gotten better for Ben Redmond and Matt Christianson now that the dangerous part of their job is over. They, along with engineers and technicians have spent the last two months inerting 170 Dahlgren and 6.4-inch Brooke projectiles that Navy divers recovered from the Confederate ironclad CSS Georgia over the summer.
Although they had been submerged for over 150 years, they were still a threat to blow up.
Matt Christiansen, safety officer of the project, a former Navy ordnance disposa; technician said that the shells definitely could have ignited in a fire or even possibly if they were dropped or struck with a heavy object.
He designed a meticulous, multi-step process to render the shells inert, First, each one was lightly cleaned to determine best area for drilling, then placed in a specially designed seawater tank. Then, Christiansen and Redmond would position themselves 20 feet from the tank behind a half-inch thick 4-by-8 foot steel plate.
And, Then. --Old b-Runner