Boats can travel through 1 block thick walls

Minecraft boats can be used to travel through 1 block thick walls. This works in any direction.

How to reproduce:

1. Place down a boat as close to the wall as possible. Ensure that the bounding Box is slightly inside the Block. You might have to give the boat a small push to make it work in step 2.

 

2. Enter the boat and travel through the block.