What you are looking at on your right is the pride and joy, basically the heart of the cooling technique used. It's called the Aquabox.
The aquabox are basically two huge cooling ribbons. Inside is a clever water circuit. Basically on the inside we can see the silent pump. Hot air from the is being sucked in with the help of the pump and then pumped upwards. The water will fall down and cool itself.
Here you can see the top and a little of the inside. All the way below is the waterpump, which you will not hear working as it's that silent. Don't let the fan grill fool you, there is no active fan in there. Fun thing is, you could mount a fan to it if you wanted to. But there's absolutely no reason to do that.
All the way at the bottom we see an in and out flow for the tubing, clearly displayed with the arrow stickers. Again one wire that'll go into the PC. It's for the pump and it feeds power off the PC's PSU.
To fill up the Aquabox we need to unscrew a lot of screws. We remove a mount that prevents water leakage. This is where you need to fill the reservoir with water (with the help of an included funnel). We'll display that later on.