Swim down is broken. More like swimming through molasses than water.

Thank you for your report!
However, this issue has been closed as Cannot Reproduce.

We were unable to reproduce the problem you are describing in the latest version. Have you tried tapping the sprint button to initiate the swimming animation?

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Are you kidding me? Everyone in my realm is having the same problem. While in deep water, point the crosshairs straight down and push "W". (are you using the Xbox controller, by chance? I'm using a Logitech controller with a keyboard emulator, but the problem exists using the keyboard as well; my friends who play with mouse and keyboard are having this problem, too.)

In the Java version, you will still swim straight down. In the Windows 10 version you will move forward laterally while ever-so-slowly sinking down. I made a video clip and it took me a full 30 seconds to go from the surface at 61 blocks to 47 blocks, a mere 14 blocks in elevation. I had to split clip in two for size reasons, and the two halves don't exactly line up, but the point is still there.

Sprinting will only move you faster laterally, you won't dive any faster. Before this latest update you could dive straight down and reach the bottom quickly by aiming the crosshairs straight down and moving forward (W, joystick, whatever) just like you still can with the Java version.

Also, you have to be in Survival mode for this. Creative mode, even if you're not flying, you can still dive down ... a lot faster than previously from what I can tell.

Ah ok, apologies, I thought you were referring to the new swimming which can be seen when using the experimental features toggle (

)

I can see what you mean now, that the rate at which you sink in water without experimental features is much slower than that of the Java edition.

No worries. I just didn't explain it well enough, and that's my fault. I was glib instead of thorough. I haven't tried the experimental features yet. I spend most of my time playing in realms, and our group is reluctant to risk making those realms unstable.

I didn't know if this would be reopened, so I filed another report with a better description of the problem. MCPE-32754

@Joe: This report is still open.

On Xbox one this is an issue for me as well. The B button should allow me to swim down, as it allows for flying down. But it doesn't. It is now impossible to reach the bottom of an ocean without running out of air.

Is this going to be fixed anytime soon? There's an underwater temple in my realm we'd like to tackle some time this century, if it's not too much to ask.

This should be fixed with the new swimming in 1.4.x

Yeah, it's fixed. You still can't swim straight down, but you can spiral down very rapidly, especially with Depth Strider III boots. I love it. Thanks.