This isn't 100% correct (particularly the bridge) but there aren't any other 
versions on here yet so I thought I'd give it a go...

Fm (133111@1)  C (x32010@1)      BDon't (x2444x@1)say it's over
Fm (133111@1)  C (x32010@1)       BDon't (x2444x@1)breathe a word
Dm (xx0231@1)      C (x32010@1)   BHow (x2444x@1)was I so oblivious?
  Fm (133111@1)   Dm(?)         BI (x2444x@1)didn't see how we got so deep down

(CHORUS:)
C (x32010@1)                       B (x2444x@1)       Fm (133111@1)   C (x32010@1) When we were walking on water for so long
                    B (x2444x@1)            Fm (133111@1)CI (x32010@1)didn't notice the waves crashing over
B (x2444x@1)                 Fm (133111@1) I thought we were sailing somewhere
C (x32010@1)                         B (x2444x@1) When did we start going under?

Fm, C, B x2

(2ND VERSE SAME AS 1ST) 
Now I see your colours
And now I hear your truths
I need something to pull us outta here
If we could get back up to the surface
Tell me could it be

(CHORUS)

Fm, C, B x2

(BRIDGE:)
Dm (xx0231@1)  'Cause you made me wanna fight
B (x2444x@1)                           Fm (133111@1)  'Cause I found something to believe in
                    CYou (x32010@1)made me who I am
            DmAnd (xx0231@1)it's so hard to see how
      BWe're (x2444x@1)so deep down

(CHORUS)