The end credits were famously shortened to run under 5 minutes in 1989 in order to hit a target runtime and maximize daily showings; doing so also made the crawl almost illegibly tiny and fast. The credits on the extended edition were almost 10 minutes, with a bigger and slower crawl, and extended/alternate music. Several home video releases of the theatrical edition on laserdisc and DVD actually use the newer credits, so they are not entirely faithful!

Complete name                            : The Abyss (1989) Uncut 171 m.  720p  h264.Ac3 5.1 Ita Eng Sub Ita Eng-MIRCrew\The Abyss (1989) Uncut 171 m.  720p  h264.Ac3 5.1 Ita Eng Sub Ita Eng-MIRCrew.mkv
Format                                   : Matroska
Format version                           : Version 2
File size                                : 3.27 GiB
Duration                                 : 2h 50mn
Overall bit rate                         : 2 737 Kbps
Movie name                               : MIRCrew
Encoded date                             : UTC 2020-09-13T16:30:47Z
Writing application                      : mkvmerge v5.8.0 ('No Sleep / Pillow') built on Sep  2 2012 15:37:04
Writing library                          : Lavf55.12.0

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : 
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 2h 50mn
Bit rate                                 : 2 000 Kbps
Width                                    : 1 264 pixels
Height                                   : 704 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 23.976 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.094
Stream size                              : 2.29 GiB (70%)
Title                                    : MIRCrew
Writing library                          : x264 core 142 r2479 dd79a61
Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 /roma_qp_offset=0 / threads=9 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=abr / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=50000 / vbv_bufsize=62500 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00
Language                                 : Italian
Default                                  : Yes
Forced                                   : No
Color primaries                          : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics                 : BT.709-5, BT.1361
Matrix coefficients                      : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177

Audio #1
ID                                       : 2
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Mode extension                           : CM (complete main)
Codec ID                                 : A_AC3
Duration                                 : 2h 50mn
Bit rate mode                            : Constant
Bit rate                                 : 384 Kbps
Channel(s)                               : 6 channels
Channel positions                        : Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Compression mode                         : Lossy
Delay relative to video                  : -5ms
Stream size                              : 469 MiB (14%)
Title                                    : Ita Ac3 5.1
Language                                 : Italian
Default                                  : Yes
Forced                                   : No

Audio #2
ID                                       : 3
Format                                   : AC-3
Format/Info                              : Audio Coding 3
Mode extension                           : CM (complete main)
Codec ID                                 : A_AC3
Duration                                 : 2h 50mn
Bit rate mode                            : Constant
Bit rate                                 : 384 Kbps
Channel(s)                               : 6 channels
Channel positions                        : Front: L C R, Side: L R, LFE
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
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Delay relative to video                  : -5ms
Stream size                              : 469 MiB (14%)
Title                                    : Eng Ac3 5.1
Language                                 : English
Default                                  : No
Forced                                   : No