I keep running across random air pockets in the ocean biomes. Something isn't generating the water properly.
With the new water darkness they are hard to spot. You need your brightness set to 50% to find them.
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This issue is a duplicate of MC-954. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.

MC-954 does not show it exists in Minecraft 1.8-pre3 only pre2