Skyward Sword: Under the lava hand room in fire sanctuary

[mzxrules]

Can't you just warp to the beginning of the dungeon?

[ZeldaFreakGlitcha]

@mzxrules Yes, but since you used the first key to get in here, you're screwed.

[Glitches0and0stuff]

so that isn't actually lava?

[ZeldaFreakGlitcha]

@Glitches0and0stuff The lava is really just a thin layer. If you send the beetle up it'll be hit by lava right before hitting the floor above.

[Woutendo]

wow nice! :D