For such as short section of cave the entrance has quite a bit of history. Below is a summary of what I have been able to uncover, thus far.
People have known about and have visited this cave for over a hundred years!
The entrance to the cave (note above: we are referring to Raspberry Rising as the entrance) has a small record of visitors in the past through the “vandalism” they left behind. I have included photographs of the “vandalism” (see below) which may be considered artifacts now. There is a noticeable trail leading up to the resurgence in the summer, it is fair to assume a small amount of visitation still occurs, despite it not being promoted.
Proper scientific exploration did not occur here until the McMaster group, led by Derek Ford, arrived in 1966. They explored the system until 1968. They tried lowering the sump by digging, found Tupper Sink, and Dyegone Sink and confirmed these by Dye tracing to only flow to “Raspberry Spring” (Raspberry Rising). A small drafting cave (un-named) of 30m in length was also discovered close to Tupper sink. They also dug into Dye-gone sink finding 20m of cave passage, but no way into the main system was discovered. The sump seemed the only good way in.
1971 Mike Boon took up the challenge of diving the sump (possibly Canadas first cave dive!). On the far side of the sump he was turned back on a landing 6m up a waterfall. It would need may-poling to get to the top. In 1981 Mike Boon was back with Pete Lord and Randall Spahl, bringing with them a maypole, to attempt the climb. They were turned back, unsuccessful. The waterfall was estimated to be 50m high from the water velocity.
The cave remained unexplored.
Late 1980’s Scott Haggerty (Parks employee) and a friend breath held the sump (Crazy!), to reach the farside. A sketch was done and sent to the Revelstoke office (if it still exists is unknown). No attempt to climb the waterfall was made. Around 1990, Rick Blak (who died in an accident in Arctomys Cave in 1991) with one other dove the sump but had no intention to climb the water fall. I have not found any more records or reports of exploration through the sump.
I heard about this System through Mike Boon and Jon Donovan in 2007. In 2009 Jon Donovan hiked up to Tupper Sink for a second time with Jesse Martin - his first with Dan Green - to look for a way in from the top (Jesse Martin personal communication). In 2011, Jon Donovan was up there again this time with Chas Yonge and me (I had began the exploration planning process 2 months prior). We relocated Dyegone Sink and a small cave we named Cavegone. This may be the one found by the McMaster group in the 60’s. We did not have a GPS, so will need to return. It is on the “to do” list.