TEPaul
That grass swale that you speak of is actually known by us locals as "Bobby Locke's Hollow". During the British Open there in 1951 Locke's strategy on Calamity was to aim for the grass bunker, and he did - ALL 4 ROUNDS, making par on each occasion.
Certainly it limits the damage on your scorecard - the vertical drop to the right is no bargain, and can lead to some big numbers.
Not that you can tell from the pics, but the grass in the swale is cut tight, so you can putt it if you prefer, and it is a tough chip if that is your strategy because of the tightness of the turf.
Great hole though - a world-class par-3, aptly named