Ahab is a funeral doom band from Germany(formed in Bavaria, I think).
You may not know them, but in my opinion they did just great with their latest album 
"The Divinity of Oceans".
(This one actually is form their first album "The Call Of The Wretched Sea")
e'|-6-6-5-5-2-2-3-3-| repeat 4 times
h |-----------------|
g |-----------------|
d |-----------------|
A |-----------------|
E |-----------------|
e'|-5-5-4-4-1-1-2-2-| repeat 4 times
h |-----------------|
g |-----------------|
d |-----------------|
A |-----------------|
E |-----------------|
e'|-6-6-5-5-2-2-3-3-| repeat through the hole song
h |-----------------|
g |-----------------|
d |-----------------|
A |-----------------|
E |-----------------|
I'm sure that there is missing something like a bass harmony 
but I really don't have any idea how to figure it out. 
If you have a better tab of the song than mine, just submit it!
And please don't kill me for bad language - English is not my mother tongue.