He what? "Snuck" into the Shatila camp???

""After five years of doing little but drink, party, and pick up women wherever he went, Eric snuck into the Shatila Palestinian refugee camp on the outskirts of Beirut in 2008". What does that dumb statement mean? He snuck?  The camp is quite open and it has no walls or enclosures for people to "sneak in".  (thanks N.)