Deadliest Catch, Discovery Channel

CGI was used in the first two seasons, and again in season 5 after the sinking of the Katmai, to demonstrate how the severely cold water of the Bering Sea causes men without survival suits to drown within minutes, showing the decrease in blood flow and the gradual failure of vital organs.
In the second episode of the first season, CGI was used to show how a crab trap works.
In the early episodes of season 2, CGI was used to show how the overloaded deck of the Big Valley caused her to sink.
In season 3, CGI was used to show sea lions playing with crab pot buoys, as what was believed to happen with Northwestern's crab pots before opilio season that year.