None.

The moment the Soviet nuclear submarine Komsomolets sank underwater is talked about, along with how many people who died or survived, hence the shipwreck is shown several times throughout.

None.

Barely any to no drinking and smoking.

The Komsomolets accident is talked about throughout. Additionally, worst case scenarios related to the shipwreck are later talked about. For the people engaged to the case at the time, this could possibly have been troubling for some.