Could I join the circle?

I've been trying to basically make a concealed elevator (i.e. no redstones since the entire thing is underwater) Yeah... that didn't work lol

So basically, I created everything necessary for an underwater elevator... but my issue is that since I'm using a 4 pulley set up, I'm trying to figure out how to descend down with a control panel for all four. I figured how to get back up -> A lot of redstone+repeaters+pistons = quick speed to the ...