Can anyone explain to me what an Overdrill is?

[Extra sauce]

Is it the name of some achievement, or some kind of secret heist? and if its a heist what other heists can be unclocked?

EDIT: thanks guys for explanation

[AvatarMan]

During Death Wish First World Bank, you and 3 players must perform a pattern to unlock a 2000 second long drill, after that you need to perform another pattern to unlock a secret vault with 20million worth of gold.

From the original FWB (PD:TH)
https://steamcommunity.com/sharedfiles/filedetails/?id=113617883

and the current FWB
http://steamcommunity.com/sharedfiles/filedetails/?id=538995264&searchtext=Overdrill

[Kalysus]

It was an easter egg for first world bank since the first payday game but can be done in the second game. You will require 4 real players in order to do it. It opens a hidden vault that has a large amount of cash in it. I would look up tutorials on how to do it if you are intrested.

[Extra sauce]

Originally posted by Sir Ruffington:

During Death Wish First World Bank, you and 3 players must perform a pattern to unlock a 2000 second long drill, after that you need to perform another pattern to unlock a secret vault with 20million worth of gold.

ah so its a sort of challenge / achievement to do while on a heist?

[AvatarMan]

Originally posted by Steamfriends.net:

Originally posted by Sir Ruffington:

During Death Wish First World Bank, you and 3 players must perform a pattern to unlock a 2000 second long drill, after that you need to perform another pattern to unlock a secret vault with 20million worth of gold.

ah so its a sort of challenge / achievement to do while on a heist?

Well I wouldn't go out of my way to do it xD But yes, it's a crew challenge of sorts.

[raifu]

Overdrill was a secret part of First World Bank heist back then on Payday:The Heist (the first game), it consists on doing a certain thing in that heist to grant you access to a secret vault which has around ~80 bags worth of gold, but it takes around a full hour to complete.

There's an achievement for that, and even guides.

[Extra sauce]

Originally posted by Sir Ruffington:

Originally posted by Steamfriends.net:

ah so its a sort of challenge / achievement to do while on a heist?

Well I wouldn't go out of my way to do it xD But yes, it's a crew challenge of sorts.

much appreciated. thanks!

[Extra sauce]

Originally posted by Kalysus:

It was an easter egg for first world bank since the first payday game but can be done in the second game. You will require 4 real players in order to do it. It opens a hidden vault that has a large amount of cash in it. I would look up tutorials on how to do it if you are intrested.

will do, thanks :)