Wrong forum If I default on Investor Mortgage?

Basically, we bought an investment property back in '03 in Lmk. House is still worth more(I think!!)than when we bought it. It is currently rented out but rent only covers 70% of the mortgage. I want to sell it but there is no sign of the tenant leaving ,he has been in the house for five years. All I can see is the value of the house going down and more work needing to be done on the house, which obviously costs money. I see myself as an accomodation provider who is making nothing! When we got the mortgage the only security needed was the house we were buying, so basically my question is --if times got tough and we defaulted on the mortgage,assuming the house would be repossessed, would we then be liable for anything else?? any other advice also appreciated.. thanks