The islands in this example are linked by bridges. In this case players don't walk across the entire bridge, but teleport from one end to the other when they get close enough. This is handled with the dbb_teleport_on_contact
script. Each bridge has a copy of this script on it and references an invisible target object as the spot the player will move to. This script has a few properties on it:
Target
Notify Camera
Teleport FX
dbb_destroy_after_delay
script.