Secret Bay is filthy at time....... yeah I feel for you. I spent 10 days at Anilao, saw used diaper, women maxi-pad. The second last day we stopped at the Secret Bay beach because the DM need to stop by his family's place a bit, I jokingly said to my fellow divers that I have seen all human waste trash possible, accept for used condom....... long and behold, one of the ladies used a tree branch to lift up a used condom waving at me. Good thing I wasn't in the water, I burst into laughter and it was just totally silly moment.
Anyway, Nicool, if you dive rebreather, contact Mike at Crystal Blue. In our trip, one of the guys dove rebreather. He got assign to the boat where everybody has best air consumption. Crystal Blue don't have pure oxygent tank but I was told when the rebreather guy need oxygen, they have to go out about 35 minutes away to pick or refill the oxygen for him. They go out of their way to accommodate the diver. I'm sure high tips is expected. I feel sorry for the DM on the boat that has rebreather diver, I heard that the DM ran out of air almost every dives and at one point he had to buddy share air with one of the diver while still pointing out creature to all the divers, talk about dedication!