The Civil 3D 2016 Geotechnical Module Overview Videos
The first video in the first series overviews the Geotechnical 2016 extension's features.
The the rest of this series contains a 2 more basic training videos.
The second series covers advanced issues and details in a 7 part training series.
A selection of videos and video list from Gary Morin of KeyNetix, Ltd published on YouTube.
These videos cover core methodologies for the management of multiple surfaces in Civil 3D.
Remember that you can hop between videos in a series using the list icon