The Blue Glow of the Imbued Ice Flour's Myth Roll

We can dimension door four people out. But we don't know where it is. We would see it glow because it's pitch dark and all of a sudden. You're all going to fall off and down the tunnel in any place. If we peek our head in, can we see a faint blue glow from within this cavern anyway? From your perspective there, make another perception check for me. There is no sign of the blue glow from this perspective, unfortunately. It was almost 19 minutes to sign.