If there is a 1 block height hole and a water source next to it, you can walk through it.
I attached a video (no Audio) where you can see it how it works
Environment
Windows 10 64Bit
i7-6700k, GTX 1080
Java 8 Update 171 (64-bit)
Java SE Development Kit 8 Update 171 (64-bit)
well i mean you dont want to suffocate in the stone blocks do you?