How to make a teleport to hell when an objective is completed?

[Seitan]

For example:

I have a 5 control point map, the middle one must trigger a massive player teleport into a loot island location when one of the teams capture it, what is the input on the middle point to do something like this?

EDIT:
Also I would like to make the players who left the loot island have that overhealing + uber effect when being teleported back to their spawn locations like on Helltower

 

[Seitan]

bump

 

[RodionJenga]

Well you would want the team_control_point to output through either OnCapTeam1(and 2) or OnOwnerChangedTeam1(and 2) to activate a trigger_teleport brush with a destination on your island.
Outgoing effects could probably be done with an appropriately set trigger_add_tf_player_condition at your return teleport or teleport destination.

You can of course check decompiled hightower event and see how it's done there.