second dark temple key help

i cant get the secong dark temple key of tovus bog
there a yellow door (power bomb) i cant open it what do i have to do

Well, what's the second Dark Torvus Key? They aren't numbered y'know!
But I'll be nice since you're a noob (lol - ya gotta rub that in here and there - don't be offended mf); you're probably missing #2...
1) Dark Torvus Bog - Dark Torvus Arena: Use Boost Ball.
*2) Dark Torvus Bog - Undertemple Access: Access via the Portal from Torvus Bog - Hydrodynamo Shaft.
3) Dark Torvus Bog - Venomous Pond: Use your Grapple Beam.

can you tell the the way i can walk to the hydrodanamo shaft
how i walk from the hydrodynamo station to the hydro shaft plz tell me

In the Hydrodynamo Station, get in the water and go to the bottom of the room near the central pillar. Walk around it until you see a Purple Door with a Missile Expansion in front of it; jump down to the ledge below it and Scan the Panel. Now jump back to the central pillar and get up to the Purple Door and Missile Expansion; head through that door to get to a room with a White Door on one side and a Black Door on the other. You need to follow each of these doors around to Panels like the one you just Scanned to get the Missile Expansion. This will raise the floor at the bottom of the room in the Hydrodynamo Station - go through that door to get to the Hyrdodynamo Shaft. Scan the Alpha Blogg (who you'll fight soon), make your way to the bottom of this room, through the door to the Main Hydrochamber and through the next door to the the Hydrochamber Storage...