on break:
    player is sneaking
    set {loc::%event-location%} to event-location
    loc()

function loc():
    wait a tick
    loop {loc::*}:
        loop blocks in radius 1 around loop-value:
            if loop-block is not air or sand:
                set loop-block to sand
                set {loc::%loop-block's location%} to loop-block's location
                loc()
            delete {loc::%loop-value-1%}