Secret island in Goldeneye

[Arjahn]

In Goldeneye 007 on the first level, Dam, there is a hidden island accesible only by using a cheat device and Noclipping to it. The island has a small inactive sentry tower and a few guards. Alledgedly, you were supposed to take a speed boat from the dam to the island, evidenced by the rideable speed boat entity still existing the game's code, but was scrapped for some reason.
EDIT: I've heard that this was due to the limited memory of the N64 cartridges.