Let's build two lists since OP claims that "many dive ops don't dive on Sundays" (but can't name one).
Sunday Divers
Blue Angel
Dive Paradise
Dive with Julio
Dressel
Jungle Divers
Liquid Blue
Salty Endeavors
Tres Pelicanos
Scuba Shack
Blue XT Sea
Dive With Martin
Aldora
Sunday Non-Divers
???
Sunday Divers
Blue Angel
Dive Paradise
Dive with Julio
Dressel
Jungle Divers
Liquid Blue
Salty Endeavors
Tres Pelicanos
Scuba Shack
Blue XT Sea
Dive With Martin
Aldora
Sunday Non-Divers
???