Crack In the Ice - Bitter Cold
You just need to remake the elixir again as car as I remember. The elixir tomes out at reset which is annoying. If you need the ingredients list; https://wiki.guildwars2.com/wiki/Thaw_Elixir
You make another elixir, just like you made it the first time:
https://wiki.guildwars2.com/wiki/Cold_Resistance
Alternatively, if you’re fast and do it perfectly, you can take the tube over the area, fall to the switch and rush to the entrance. It’s much easier if you can either move while downed or have someone else press the switch so you can fall right to the entrance.
Thank you for help. Will do my best to make the elixir again, don’t think I am fast enough for the tube but might give it a go.