devtrackers.gg
The giant cave that totally looks like the final one is not actually the final one. I got bamboozled there as well because I had 230ish morkite, but there's a patch in the top left (from entrance) corner that leads to another cave.
Yup, we had to search for a while too. It should be impossible to levels to spawn without enough Morkite. You just need to look harder.