Abysse Grand Cru is a chardonnay champagne aged four years in the conventional way, then for one more year underwater in a secret location 200 feet deep off the coast of a remote French Island.
Now you can buy a bottle for $1,900. It's dry, with notes of caramelized peach, toasted almonds and a "refreshing minerality." (I hope that's not a euphemism for "tastes like salt water.")
Sure, it's a gimmick, but a good one!