Something grabs your leg

Before you realize what's happening you're pulled underwater. You gasp, expecting your lungs to fill with water but instead are gifted air by a strange bubble now clamped to your mouth.

Thankful for small blessings you get your bearings. You're some distance below the surface now, but thankfully aren't descending any further. Further, you realize as you glance down, into the giant hole, which only looks bigger and darker up close. Some group of strange, invisible forces are grabbing at you, trying to keep you from thrashing about. One **** gets ahold of your loincloth, stretching out the string as far as it goes before it snaps, drifting off into the water and leaving you more naked than before. There's no time to worry about indecency right now, you have precious few moments of energy left to decide how you're getting out of this.