Portal Stories: Mel - Episode 8 "Pointless Light Bridge"
Channel: LB
Date: 2016-02-01

Maybe I'll find out what it is for when I get around to playing the advanced series.

Get the game: http://store.steampowered.com/app/317400
Read my review: http://steamcommunity.com/id/_LB/recommended/317400

This video is also on Twitch: https://www.twitch.tv/lb___/v/107885436