Syncing to a shell far below one's starting position (e.g. shell A at Y: 80 to shell B Y: 11 (for mining)) causes a death from fall damage and dumps shell A's inventory, but kills shell B. The player then resyncs back to shell A, with an intact inventory. The player can then go to where shell B died to collect the duplicate inventory of shell A, thus allowing for a player to repeatedly double their inventory. It should also be noted that shell B's entire inventory will be destroyed in the process.