I have been testing a piece of bamboo here in Hawaii for about 6 months. I have it attached to my 2# drop anchor. Why? One was to test the durability (banging against coral, rocks, lava, etc). the second, because I was told that bamboo has many air pockets within it and that at depth it may fail, it may not stay epoxied, etc. I've heard it all. So far, not a bit of warp, no crushing, no delamination, nothing!
For what it's worth, I used a piece of bamboo plywood scrap, used West sytems epoxy, and then even routered 2 edges to see how the woodworkability (is that a real word) would be and see if that would cause any change in the wood composition. Again, so far, I am impressed and plan on doing several gun samples (a hybrid, an open track, and an enclosed track). Again, the salt water testing has not caused any problems.