The river deep

Some of the voices sound familiar but the roaring waterfall and echos of the cave combined with the muffling effects of the thick mist leave you slightly uncertain. As for the other language, you are only certain it is not one you know well.

This is a situation I would allow librarian to give advantage on the test to identify the language. I also often do success with a cost at times when you will is not quite there. This means you succeed but they're is a penalty or variation on results vs intent

Dree is able to discern the sounds of lapping water. Not unexpected save it seems that water lies between you and the two groups of people. One definitely sounds like normal people but the other is totally foreign. They have receded to mere shouting again though obviously quite agitated.

Taking the lead Dree advances, torch held aloft guttering in the constant deluge of mist from the fall nearby. After only a few yards into the larger cavern you find you are on a small shoreline with water to your left and the cave wall to the right. The shore gets bigger the further you go into the room and it curves to the left before narrowing again and ending in a small peninsula extending into the river/lake(?) The shouting is coming form ahead and faint flickers of light can be seen through the dense mist. Though the light is coming from somewhere in the middle of the water there are multiple large rocks jutting out of the water. The flickering light of torches reveals a larger mass with figures moving on it and it looks like you may be able to reach it by jumping form rock to rock

Glidbem knows from her brief time with Nel that he has little to fear from the slippery rocks as he is very nimble and experienced with moving about on slippery surfaces from living aboard a boat most of his life. Looking around and cocking his head at the sounds echoing around the misty cavern he whispers I would rather stay nearby you than alone with a mix of hope, fear, and bravado.

Len and Glidbem stay on the cave shore as Serig and Dree make their way across the slippery rocks. Save test to keep your balance, Any roll with at least one dice 5 or higher and you have no trouble. if the highest dice is a 4 you slip but manage to catch yourselves, anything lower and you fall in.
Moving out over the water you near the sounds and see a large flat river boat, likely the one you saw sucked under the river by the whirlpool. Though you still can not see individuals clearly you vaguely make out forms moving on and around the boat, which looks to be resting atop several rocks like those you are crossing on.

This cavern is under the river and has a small flow of water through it. You can tell form the waters surface that is has a current though it does not appear strong in this area.

The crew explained that the whirlpool turned into a massive wave/current that pushed the boat to its present location, resting atop the rocks, before dissipating. The crew could work the boat off the rocks that now hold it above the water but they would have to unload the boat first. They were in the process of preparing to do that when they were surrounded by people rising from the water.