Real Journeys Te Anau, which is in charge of transporting the school group to and from the camp, said the slip should be cleared by Friday, when the students were due to leave.
"Contractors are in there fixing the road and at this stage they are saying they should have it open for Friday so we're confident as we can be that the school group will come out on Friday as per their normal schedule," spokesman Paul Morris said.
"They're stuck in there from the point of view that they can't come out but they were never going to be coming out until Friday anyway."
On social media, word from Deep Cove was upbeat and the group was not phased by the incident, according to one Facebook post.
The scene of the huge landslip in Fiordland. Photo / supplied
"Hello from Deep Cove," Facebook user Alice Casey wrote on the school's Facebook page this afternoon.
"Having an AWESOME time with the kids and the best parents YET!!!! Torrential rain, avalanches and thunder and lightning storms have not dampened our FUN!"
She signed off with a cheeky postscript: "Has anyone got a chopper if needed?"