Rule 25: Abnormal ground conditions.

(i) Through the green: If the ball lies through the green, the player must lift the ball and drop it without penalty within one club-length of and not nearer the hole than the nearest point of relief. The nearest point of relief must not be in a hazard or on a putting green. When the ball is dropped within one club-length of the nearest point of relief, the ball must first strike a part of the course at a spot that avoids interference by the condition and is not in a hazard and not on a putting green.
(ii) In a bunker: If the ball is in a bunker, the player must lift the ball and drop it either:
(a) Without penalty, in accordance with Clause (i) above, except that the nearest point of relief must be in the bunker and the ball must be dropped in the bunker, or if complete relief is impossible, as near as possible to the spot where the ball lay, but not nearer the hole, on a part of the course in the bunker that affords maximum available relief from the condition; or
(b) Under penalty of one stroke, outside the bunker keeping the point where the ball lay directly between the hole and the spot on which the ball is dropped, with no limit to how far behind the bunker the ball may be dropped.
(iii) On the putting green: If the ball lies on the putting green, the player must lift the ball and place it without penalty at the nearest point of relief that is not in a hazard, or if complete relief is impossible, at the nearest position to where it lays that affords maximum available relief from the condition, but not nearer the hole and not in a hazard. The nearest point of relief or maximum available relief may be off the putting green. The ball may be cleaned when lifted under rule 25-1b.