"Sometimes we'd get a bit stuck, but there was always someone there to help. It wasn't really scary as such, but it was quite realistic," he said.
Coastguard boats, fire engines, police and ambulances were all involved, operating from Onerahi Boat Ramp. Nearby residents may have noticed smoke from smoke bombs and a controlled fire on the island - all part of making the scenario as realistic as possible for the students.
Northland programme co-ordinator Shona Morgan said the day also required six volunteers, whose responsibilities were to get lost, pretend to drown and cover themselves in fake blood and grazes.
"They were very dramatic," she said.
The day was challenging and nerve-racking for the students.
"They take a while to get into it, I think a few of them were quite nervous ... [Northland Rescue Helicopter] flew them in and most of them hadn't been in a helicopter before. To hear people screaming in the bush, that's quite scary too," she said.
Ms Morgan said the aim was to encourage students to get involved with the emergency services, either in a volunteer or professional capacity.
This was the third year the YES programme had run in Northland, with the 2016 intake including students from Bream Bay College, Tauraroa Area School, Mangakahia Area School and Otamatea High School.