You manage, but it has some deep splinters in it. The hole seems to lead into a dark passageway.

I try to remove the splinters, best as I can before looking down at the passageway.

He yelps in pain but lets you. It's too dark to see anything.

(Do you know why Grape isn't replying to any of my pings?)

(I'm sort of keeping them busy in their Dragonverse thread. Whoops.)
I try to find some sort of small object to toss down there to check for traps.

(I know but she usually replies, since it'd come up with me pinging her 3 pings at the top. I manage to do you and someone else at the same time equally, right?)

You throw some rock down, the whole tunnel lights up with runes as it falls down. You hear it plop into water.

I try to see if there's string or anything I can use to tie something up to see what exactly is happening.

There is nothing.

(Ah, I sort of triggered an enormous quest, which may be the reason)
I sigh. Water. This is high up in the mountains. I try to open the hole wider.

You manage to make it big enough to squeeze through. You may be accepting if you go down there a battle.

I decide to try to go down there anyway. With Chestnut.