Equipping the SDAR and going underwater results in loss of control, and becoming stuck in the animation/movement state of slowly swimming forward. This persists even when the player is on land.

The only response to controls is if you press swim up/down to change height, in which case the animation may end and the player ceases all movement.

This occurs if going into the water from land or from a vehicle.

It does not occur with other weapons. The loadout (e.g. rebreather) does not appear to alter the behaviour.

It can only be ended by unequipping all weapons, which is not normally possible in water.

This took place in the context of an 'Adapt' campaign scouting mission. It was consistently reproducible across saves and a revert.

A video of most of the above is available here: http://youtu.be/1AfWeUZDDhA

Curiously, there is the opposite of this bug here: http://feedback.arma3.com/view.php?id=17077