Monster from the Deep

I was walking around the Burj Khalifa lake this evening and spotted this lurking beneath the water.
It's a remote controlled underwater vacuum cleaner that they use to suck up the dust and dirt thank sinks to the bottom of the lake and keep it looking nice and clean - although it was having a rest when I saw it.
If you look through the reflections you can see the caterpillar tracks that it drives around on along with all manner of other mechanical bits and pieces.