It seems that Treyarch put secret Easter eggs on every map in Black Ops 4, and that is a great thing if you're an aficionado of the series.
You can find one of the most mysterious Easter eggs on the Hacienda map that is modeled after a mob of gangland mansion.
As soon as you spawn in Hacienda, you need to head toward the other side of the building. You will find a private beach there with boats. Then jump into the water and you will see a dead body wrapped in a plastic bag and tied up to the bottom of the ocean with a chain.
Looks like somebody just got rid of an important witness.