Attention:
The initial shipment of the DVD release of Shackleton's Antarctic Adventure had a defective Dolby Digital track, which was corrected for all subsequent manufacturing. The DTS track was always properly synched.
Some used copies with the defect may be circulating, but all of Amazon.com's new inventory is of the corrected edition. You can distinguish the corrected edition from the defective because the corrected edition has a blue dot under the "Image Entertainment" logo on the lower left corner of the back cover. If you have a defective edition, please return it to the retailer where it was purchased for replacement with a corrected version.
The VHS edition never had any synching issues, so none of the above applies to the VHS edition.