Artist: Helmet
Song: I Know
Album: Betty

This song is in dropped C# 
A fast way to tune like this is to get the botttom string just like the beginning of Overrated 
 drums... 
E-----------0-0--------- 
B-----------5-5-------3- 
G-----------5-5-------2- 
D---------3---------0-0- 
A---------3---------0--- 
D---------3---------0---  

there's a small whammy bar dive in there somewhere  

D-5-4-3-0-----0 
A-5-4-3-0-----0 
D-5-4-3-0-----0  

E-1- 
B-3- 
G-3- 
D-1- 
A-1- 
D-1-  

The next part is natural harmonics on the 10th fret, and then 2 times on the 9th. 
 
D-4-3-0-0--0 
A-4-3-0-0--0 
D-4-3-0-0--0  

then  
D-4-3-0-0--0-4-3-0-2-3-0- 
A-4-3-0-0--0-4-3-0-2-3-0- 
D-4-3-0-0--0-4-3-0-2-3-0-  

do the intro stuff there  

end of 2nd verse  
D-12-10-0-10-12-0-10-12 
A-12-10-0-10-12-0-10-12 
D-12-10-0-10-12-0-10-12  

Interlude  
D-4-3-0-5-4-3-0-2-3-0-3-4-0-4-6 
A-4-3-0-5-4-3-0-2-3-0-3-4-0-4-6 
D-4-3-0-5-4-3-0-2-3-0-3-4-0-4-6  

Then strum these chords:  
E-1-----0-------------------------- 
B-3-----5-----3-------------------- 
G-3-----5-----2-------------------- 
D-1-----3-----0-----4-3-0-5-4-3-0-0 
A-1-----3-----0-----4-3-0-5-4-3-0-0 
D-1-----3-----0-----4-3-0-5-4-3-0-0  

E-1-----0------------------------------------------ 
B-3-----5-----3------------------------------------ 
G-3-----5-----2------------------------------------ 
D-1-----3-----0-------4-3-0-5-4-3-0-2-3-0-3-4-0-4-6 
A-1-----3-----0-------4-3-0-5-4-3-0-2-3-0-3-4-0-4-6 
D-1-----3-----0-------4-3-0-5-4-3-0-2-3-0-3-4-0-4-6