Ahead of you, the face of a snarling minotaur is etched into a sheet of iron that bisects the crawlway. Its eyes have been cut out, letting you see through the sheet, beyond which the tunnel continues onward.

Kurma decides not to go further and comes back to tell the others what he found.
He then turns invisible again and check the small corridor going south

If it hasn’t been a minute yet Isabella will squeeze through the entrance Kurma came from and look through the sheet of iron. 

Quote from BeastyC >>

If it hasn’t been a minute yet Isabella will squeeze through the entrance Kurma came from and look through the sheet of iron. 

 Isabella, after a quick investigation, discovers that the sheet of iron can slide up into the ceiling if enough lifting force is applied.

Quote from _Grimnir_ >>

Kurma decides not to go further and comes back to tell the others what he found.
He then turns invisible again and check the small corridor going south

A balcony faces a vast pit. Between the balconies hover five wooden platforms, each one a disk ten feet across. A single torch burns above each balcony. On the east balcony stands a rough-hewn, fifteen-foot-tall statue of a hulking fiend with furled wings and clenched fists. Set into the wall on the west balcony is a rusty lever in the up position.

Kurma quickly comes back and shares his finding with the group.

Gertrude listens intently to the reports from Grimnir and Isabella. "I know, we should go and..." her voice trails off, she scratches her goat beard. "Ah, yes, now I know, we'll go over to the balcony and then... or maybe the metal shield, yes, that's the way! Or maybe the balcony and from there we should..." She scratches her chin again. Then shakes her head. 
"You guys decide. I'll follow!"

“I’d be tempted to go through the metal door. Not sure what to expect from a large pot with round plate forms, but it’s probably bad” adds Kurma 

Brunella is silent, ready to go with the rest of the ground in whichever direction.

"We probably need Gertude to go first. This metal sliding door seemed pretty heavy". Kurma show the way to the group.
(casting Guidance on Gertrude if it requires a Athletic check)

"If you say this is the best way to go!" Gertrude trusts Kurma and shrugs her shoulders. Then squeezes into the crawlway and pushes up the metal sheet. 

She tries to find a way to fix the shield in a lifted/open position (or tries to hold it in place for the others to crawl through). 

Quote from tiomila >>

"If you say this is the best way to go!" Gertrude trusts Kurma and shrugs her shoulders. Then squeezes into the crawlway and pushes up the metal sheet. 

She tries to find a way to fix the shield in a lifted/open position (or tries to hold it in place for the others to crawl through). 

 OOG Roll an Athletics check

athletics 9 + guidance 1

[OOC: I am a Goliath, so I have "powerful build"  and therefore count as a large creature when pushing something or carrying - just in case that has any influence]

It seems too heavy for Gertrude.

Brunella walks up and attemps to lift the door. She squats down, puts her hands below the door, and lifts, using her quads, arms, back, and heels to exert maximal force on the door.

Brunella's strength is no match for the mechanical device. The sheet slides upward and a hidden latch locks it in place. It would be possible to crawl underneath and pass to the other side.

Without crossing the line... Would Kurma see any trap mechanism ?
Investigation: 4 ...with guidance + 2

In a annoyed tone "Get out of the way let me tale a look at it." Isabella pushes past Kurma looking at the line where the sheet drops into. Still concentrating on Ghostly gaze she will look through the rock.

Investigation: 21

Gertrude steps back and lets Brunella take a turn. With ease her dwarven friend lifts the Minotaur door. Gertrude is surprised. She had been sure this door was unable to be shifted. Maybe too old and rusted in place. 

Then her thoughts move to Isabella. Gertrude watched her push past Kurma. She wonders where the sudden change of character comes from and decides to ask Isabella at the next rest. 

Neither Kurma or Isabella see any trap mechanism embedded in the section where the iron sheet is

Then Kurma turns invisible and continues forward