The $1,000,000 was always guarded by two Wells Fargo guards on the show.
In season two, the $1,000,000 prize was $900K, plus $100K in prizes (two cars, 20 round trip tickets, a house full of furniture, etc.)
This would be the first ever game show in television history to award couples $1,000,000 in cash ($40,000 a year for the next 25 years beginning in the first season). It would be another 12 years before the ever popular "Who Wants to Be a Millionaire".