See Yellow Vault Locations for a list of all Cubiecranes and Yellow Vaults.
Fueling the Cubiecrane
Before a cubiecrane can start working to build a yellow vault, it requires one million resin as fuel. Players collaborate to fuel the cubiecrane by dragging resin into it in units of 10,000 resin at a time. When completely fueled, the cubiecrane awakens and will begin construction. After one week of construction, a yellow vault will replace the cubiecrane permanently.
Each increment of 10,000 resin provides the player with 100x Tier 1 Leaderboard Points.