Lumineers - Submarines chords

Love this song--I think it's the best song, lyrically speaking, that's been 
written in probably the past 10 years.

[ Tab from: http://www.guitaretab.com/l/lumineers/317822.html ]
G            Cadd9               D -D -D 
I believe submarines
G            Cadd9               D -D -D 
Underneath deep blue seas
G            Cadd9               D -D -D 
Saw the flags: Japanese
G            Cadd9               D -D -D 
No one will believe me
Em
Ran back to the town bar 
G
And I told the people how
Em
I had seen the submarine
Cadd9
And everyone laughed aloud 

(Repeat Chord Progression)

I did spy periscopes
Dead of night on the eastern coast
The police made them jokes
Told me I'd seen a ghost

Everyone thinks I'm a liar
No one knows the truth
If it was a bigger fire
I would be on the roof

Ships will rust in Baldwin Bay
(Let me go!)
No one trusts what I say
(I don't know!)
Oh my God, no one paid
(Attention!)
Overnight my hair turned gray
(Oh oh oh!)

In the end it boils down to credibility
I had none, so I will die with the secrets of the sea

(Submarine! Can't find me! Submarine!)

Submarine...

(Submarine!)