If you fly with an elytra into water it's a bit glitchy. But if you fly into the border of the water, you glitch through the ground. It looks like flying. Here is a video: https://youtu.be/XUM8SF_8e4A?t=30s
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MC-100025
Elytra Glitch
Resolved
Duplicate
0
migrated
(Unassigned)
Unconfirmed
Minecraft 1.9
Retrieved