At the beginning of the game, Crash gets teleported from some island ruins to the warp room that serves as the hub of the game. The first room seems to be made of carved stone and looks like the ruins that are found elsewhere on the island, but later rooms look like ice, sewer pipes, a mine, a space station, and
a castle(?) in the case of the secret warp room.
Has Naughty Dog or any licensed source (strategy guides, etc.) ever established whether it was Cortex or the islanders who built the warp room?