An underwater housing is a watertight pressure-proof box with controls that allow you to operate the camera inside it. Underwater housings have to be sturdy. They have one main job- to keep your camera and lenses dry. The best housings have fine ergonomics and allow you every chance to get ‘the shot’. The top of the market housing is expensive as a result. You can buy cheap housings but in our experience, these break easily and are more hassle than they are worth. Stick to a known brand with a good track record. We suggest finding a local and trustworthy dealer who you like and trust and then buying from them. Usually, a dealer will work with four or five brands (at the most) so you’ll still have a bit of selection available to you. A benefit of forming a good relationship with a dealer and a certain brand is that you’ll ensure that you have good after-sales service. You can mainly choose from strong plastics such as acrylic, polycarbonate or Lexan plastic, alternatively metals such as aluminium ( usually for the DSLRs).