Hey, if they built this underwater roller coaster at Lake Silver, they would have to run it through a tunnel...if they themed it to look like a cave, they could put the "wreckage" of a diving bell down there, and maybe some barrels and gunny sacks containing Grandpappy Dugan's lost treasure of silver! Hey, what about some special effects so you could see Grandpappy...and maybe Rube's...ghost, or Eli Tolts' wrecked submergible? Ah, the possibilities.