Chapter headings, v1.00:

Blu-ray headings:

My Name Is Oliver Tate
The Pamphlet
Under The Bridge
Two Weeks Of Lovemaking
Cinema Night
Relationships Are Tough

The Graham T Purvis System
Medulloblastoma
Friday
New Year's Eve
I Think This Will Matter When I'm 38
How Deep Is The Ocean


This is based on the 23.976fps Blu-ray chapter positions.
Times for the PAL 25fps DVD will likely be 4% shorter:

01, 0:00:00, Submarine (2010) 01 My Name Is Oliver Tate
02, 0:01:00, intro MUSIC, Stuck On The Puzzle (Intro), by Alex Turner
03, 0:01:51, PROLOGUE
04, 0:05:03, PART 1, JORDANA BEVAN
05, 0:07:31, 2 The Pamphlet
06, 0:14:12, 3 Under The Bridge
07, 0:19:53, 4 Two Weeks Of Lovemaking
08, 0:24:40, celebratory cassette MUSIC, Hiding Tonight, by Alex Turner
09, 0:26:15, super 8 FILM, Two Weeks Of Lovemaking
10, 0:28:21, 5 Cinema Night
11, 0:35:09, 6 Relationships Are Tough
12, 0:43:14, 7 The Graham T Purvis System
13, 0:50:18, 8 Medulloblastoma
14, 0:52:07, Last Day Of Term
15, 0:53:17, deathly MUSIC, Glass In The Park, by Alex Turner
16, 0:57:36, 9 Friday
17, 0:38:55, PART 2, GRAHAM PURVIS
18, 1:06:48, 10 New Year's Eve
19, 1:08:42, PART 3, SHOWDOWN
20, 1:14:49, 11 I Think This Will Matter When I'm 38
21, 1:17:39, despondency cassette MUSIC, It's Hard To Get Around, by Alex Turner
22, 1:25:59, 12 EPILOGUE, How Deep Is The Ocean
23, 1:30:18, ending MUSIC, Piledriver Waltz, by Alex Turner
24, 1:30:27, end credits
25, 1:33:26, end credits MUSIC, Stuck On The Puzzle, by Alex Turner
26, 1:36:53, end

Amazing wow, unless one is not the sort to go for this sort of story.