Kim,

The arch collapsed between 2011 and 2012. We were there both years. We had not been there since. On our trip this past June, we were surprised to see the passage totally reopened. I can't remember who I asked (maybe Mickey Daniels while conversing at Cupecoy) but they told me that Mother Nature cleared the called rocks. Maybe someone can verify this.
In any case, we swam through. Rested for about 10 minutes on the little beach before continuing our long swim from Baie a Rouge to David's Hole. I had expected to be able to get a proper rest inside. It wasn't really possible with the surge of ocean in there. We did stand for a while on bare sand about waist deep before swimming out again. It's not for th faint hearted. It's a bit tricky finding your way in and out for a depth that allows you not to hit into the rocks. Total time there and back was 1.5 hours.