Guiillemin carefully inspects the area around the pillar and it doesn't appear that there is anything obvious connected to it, additionally, there are no holes in the vaulted ceiling (that might hide some spear trap or whatever) and there are no obvious irregularities in the floor around you. Lightly tugging on the handle doesn't cause it to budge."Camarades! Seems I've found something here."
Guillemin visually inspects the floor and the ceiling connected to the pillar, looking for any trace of a mechanism that could be activated by the handle.
"Crowbar?"Guillotine fixes a rope to the handle and hammers a spike into a crack in the fitted stone blocks of the wall just opposite of the recess and loops the rope over the flanged end and walks backward 10 or so feet before giving it a sharp tug. You hear a sharp grinding *click* in the column as the rope gives about a handspan. Suddenly there is sound of rushing water cascading through the column and then a *pop* and *click* in the floor at the foot of the stairs.
You glance in that direction and see a long rectangular section of the floor has risen about an inch above the rest of the floor. Walking over and inspecting it you discover some sort of stone slab with grooves notched in the side (likely for handholds or a lever) cleverly disguised as dressed stone to match the rest of the floor.
You can hear the gurgle of water draining and dripping away beneath it.
"Huh. Would you look at that. Stairs would definitely be preferable to climbing rope is we need to make a hasty retreat. Perhaps we should see about shifting some of that." Ganelon glances down the hole to check for signs of the water's passage.
Guillemin slots his crowbar into one of the 4 visible notches and levers the stone up and eventually works the bar under the lip of the 2 inch thick slab and lifts it high enough for Vandal and a couple of others to get their fingers underneath and slide it to the side. Underneath you see a stairway descend into the eatrh. The water you heard rushing through has now drained away and you are confronted with an answer and another problem. It looks as though the whole stairwell about 20' down is full of broken blocks and rubble from some kind of cave in. It seems like it probably leads to the chamber under the tripod, but clearing this would take quite some time.
Vandal wordlessly takes point on the new way down, greatsword at the ready.Maddie covers her lips with the palm of her hand in an "oops" expression when she hears the echo of the skull scrapping along the floor, but then her eyes widen when her impatience seems to pay off. As the secret passage opens, she bows on one leg, one hand on her heart and the other extended, as if after a masterful performance. If anyone could see into her mind, they'd know that she actually thinks she hears a thundering applause at the sheer stroke of luck. Perhaps she is a little crazy.
Once she's done basking at her own glory, she brings the lantern over to the newly revealed path and beckons Vandal. "Down?"
Wary of untoward surprises, Vandal pokes at the shape with his 10 ft pole. He runs it along the edges and the seam to see if any trap triggers.One by one you file into the darkened chute. The narrow flue is full of cobwebs and the stone rungs are slick with mildew, but they seem solid enough. Based on how much light the lantern casts and your own intuition it seems like the shaft must be about forty feet deep. Feeling emboldened by the stroke of good luck perhaps, Vandal descends into the tunnel and carefully climbs down and drops from the last rung onto the floor. The space is no wider than above, but with his lantern held aloft he notes two "almond" shaped holes about a handspan apart a foot below his nose, and a small bronze latch at waist level next to his right hand. To the left are two great stone hinges and there is a seam that forms a perfect oblong oval shape in front of him about 3 feet wide and 6 feet tall.