I would imagine zombies could swim, or walk through water.. Would slow them but.... They can't drown.... My thought is a aircraft carrier.. Once cleared would be the best bet. I mean, known number of walkers, self operating, lots of food and water easier to defend.
I have been a silent witness
to all of America's finest hours.
But my finest hour comes
when I am torn into strips and used as bandages
for my wounded comrades on the battlefield,
When I fly at half-mast to honor my soldiers,
Or when I lie in the trembling arms
of a grieving mother
at the graveside of her fallen son.