Digital video collected during Johnson-Sea-Link I submersible dive 4058 by Bureau of Ocean Energy Management (BOEM) in the Gulf of Mexico on 1998-07-20 (NCEI Accession 0168794)

This Archival Information Package (AIP) contains videographic data of ocean floor biology and geology at a suspected hydrocarbon seep site in the Gulf of Mexico, captured on 1998-07-20 from the manned submersible Johnson-Sea-Link I during dive number 4058. The timespan of this AIP is a single day and constitutes video from a single dive.

This AIP is part of a dataset of 149 submersible dives from 48 different lease block areas over the course of 15 dive seasons ranging from 1988 to 2002, collected for studies funded by the Minerals Management Service, now Bureau of Ocean Energy Management (BOEM). Seep communities were found in all but four dives, although sparse community development was common. Because BOEM is tasked with protecting sensitive benthic communities from impacts of operational activities on the outer continental shelf and continental slope, locating these communities is an important task. Although use of surface attributes, particularly strength of seabed reflectivity (from 3-D seismic data) has been very successful in identifying areas of hard bottom (seep-related carbonate) and gas-filled sediment, visual evidence is still considered the best and most irrefutable data. The submersible video database will provide a valuable foundation of observational data for cold seep communities on the northern Gulf of Mexico continental slope.

The video in the dataset of which this AIP is a part was originally captured on several different analog video formats. To create the digital video files which comprise the entire collection, the analog video was transferred to DVD, extracted as .avi files, and transcoded at a final stage to MPEG-2 files identified with the extension .mpg. The entire dataset comprises 3,533 .mpg clips of duration 5 minutes or less, representing a total of 280 hours of bottom time. In a few cases, the intermediate .avi files have been archived as well. In one dive (JSL_2634), video has been archived in .VOB and .mp4 format.