Was saying you ordered a Hero 2 Silver a typo?
If you have ordered one in the GoPro 4 series - the GoPro 4 Silver - you do not need an underwater housing. Don't know though about the GoPro 2 - I think you do need a housing for that.
Get the 4 - and you get a monitor on the back that you can see u/w as well.
Yes, I meant to say Hero 4 Silver. Correct this now.
Yes, get the housing rated to 60m. I used the 40m housing my GP 3+ came with and it flooded on my first dive through the port. They replaced everything without any questions. I bought the 60m housing and have had no problems.
Wow, but that shouldn't happen anyway, unless you went below 40m. Seems like the housing was defective.