This is an exact replica of an Ocean Monument from the new 1.8 snapshot. Since we don't have the materials used in 1.8 I've substituted similar blocks.

The building will be pasted directly beneath you, as if you were standing on its highest point. This makes it easier to place it at a depth where the tip is 3 or 4 blocks below the surface as you would find it generated.  There should be approximately 24 blocks of water depth wherever you paste.

WARNING!!!
You must use "//paste -a" to place this build in your landscape without creating a massive hole.

Keep in mind that 1.8 introduces new water flowing mechanics that make this dungeon look a lot better. As it is in 1.7 there are a lot of areas where air pockets are formed and they really look terrible. You get to see the dungeon shape and general layout at least.