The underwear drawer is a too predictable place to hide stuff, so here is a bunch of ideas that may impress anyone searching for secrecy.
Hidden Bathroom Tile Storage
Secret Wall Outlet Hiding Place
Entertainment Center Storage
Photo Frame Secret Box
Hidden Liquor Cabinet
Toe Kick Base Cabinet Storage
Staircase Trap Door
Secret Armoir Bed
Hidden Liquor in a Card Catalog Cabinet
DIY Doortop Stash
Camouflaged Refrigerator
Hidden Compartment Jewelry
DIY Jewelry Storage Box
Storage Computer Keyboard
Bathtub with Stowaway Storage
DIY Air Vent Vault Kit
Head of Iceberg Lettuce
This is actually fake plastic lettuce that's hollow inside.
Bar in the Staircase
Sunscreen Valuables Container
DIY Key Concealer
Glue a rock to the top of a medicine bottle and "plant" in the yard.
Deodorant Contraband Pocket
Ultimate Hiding Place: A Hollow Dildo
1 tape it in inside drawer (top side)
2 cut a hole in the back of the teddy bear
3 below a printer
or go to this url to learn how to make a rock box:
http://www.youtube.com/watch?v=rH5jbThYKg0&playnext=1&list=PL10E32CC356CF96F2&fe
ature=results_main