<Tongue-in-cheek>
There's two checks that the game needs to make in which these powers fail.
Wrong Turn at Albuquerque -- Team Tunnel needs a 14% chance to place the player and team mates at a random exit on the same map. Even if one is on the ground and the other is on the side of a building. (Thanks Korbian!)
The Wile E. Coyote Effect -- At permanent SPECIFIC points on the City/Zone maps (not all of the places, and not random, it's the same spot each time), if a player uses Tunneling abilities, they fall down a vertical shaft. If in Paragon City, they land in either Sewer Network or Oranbega. If Rogue Isles, an Arachnos base. All outcomes are essentially Radio Missions.
</Tongue-in-cheek>
Great writeup, though. Makes you think of the possibilities of it.