trunk full of water

so i installed my touch screen in my 08 lancer and noticed my sub box was wet. i took it out and noticed that the spare tire area was full of water and ice. I never drove in any deep water so i am confused. Has this happened to anyone else?

check the lights! it's surely coming in from the bolts or reteiner..
any how it come from your light. same snhit happend with my 06
get your self a silicone tube .remove your lights,seal the holes ,put back lights
job done!