On test day at the Elementary Underwater Explosive Ordnance Disposal course, the Royal Navy and Royal Naval Reserve students have to put all their experiences from a two-week course into practice under the water.
We spoke to Nige Froud, the course’s lead instructor, about the importance of the training:
"It's extremely important because if they come up and tell us something that isn't right we are then going to go down the wrong avenue and we'll think that the munition is only a practice mine, or a drill mine, something of that description.
"So we treat it completely differently to an absolute live mine and obviously he could be putting himself in danger, the next person in danger, or if the ship's close to it, the whole ships company in danger."
Lt Col Richard Hallett OBE spoke about the characteristics needed to make an effective diver:
"The reality is that we are not risk takers.
"The common thread through all of these courses, through all of the capability that we deliver is a high level of intelligence, the ability to problem solve, the ability to analyse complex problems and the ability to execute sometimes complicated render safe procedures.
"All of that requires a coolness under pressure and a steady hand.
“Our job here at the school is to try and understand, to get the best out of everybody that comes here.”
This course has seen seven Royal Navy and Royal Naval Reserve divers take part - all looking to qualify as mine clearance divers.
For the all-important test, they wear a special dive set called Clearance Diver Life Support Equipment.
Even the slightest sound, change in magnetic field or pressure could cause a sea mine to function.
In winter conditions, those taking part in the test dive the seven-metre lake record their findings for their colleagues back on shore.
AB Jamie Trickett told us about his motivation to keep going on the course:
"It makes you want to learn more really and I never thought I'd say that, but because it keeps you alive, I guess.
"It’s always about educating yourself really, and just you want to be a good member of a team."
Every year across the UK and on mine-hunters in the Gulf and the Mediterranean, Royal Navy divers deal with hundreds of underwater incidents and help keep the seas safe.
All seven students passed the course this time around, and will now become the next generation of Royal Navy divers.