Placing a trapdoor on the bottom half of the second block on a two high wall (See image below) will force the player into a swimming animation when it is opened.
MC-147826
Trapdoors force users into a swimming position
Resolved
Duplicate
0
Colton
(Unassigned)
Unconfirmed
Minecraft 1.14 Pre-Release 1
Retrieved
Duplicate of MC-147612. Please use the search function before reporting.