Wagga High's Year 12 students are the first team registered to take the plunge for the Walk the Plank event.
In support of Relay For Life, the students have nominated school deputy Tania Maddison to 'walk the plank' later this month.
"Paula Shumack who is organising the whole event is actually the head PE teacher here and approached a few of us to join in, so I thought why not," Ms Maddison said.
"It'll be good fun and it's for a great cause."
Students are on a mission to raise funds for Cancer Council NSW, with the final sum paid as a 'bounty' - the higher the bounty, the higher Ms Maddison will have to jump from at Oasis Aquatic Centre.
"To be honest I'm totally fine with jumping off even from the highest one, it's more the temperature of the water I'm worried about," she said.
"The kids are all talking about who will get the honours of tipping me over the edge, and I think they might even auction it off."
The crew of Year 12s intend on dressing Ms Maddison up for the occasion too, with a particular motive behind the idea.
"I'm more than happy to dress up, but there are some regulations I gave them," Ms Maddison said.
"They can't put me in a ball gown or anything because I'd just sink."
Spectators can watch Ms Maddison make a splash on September 26 with a gold coin entry fee.