What happens to all religious imagery in the Soviet Union? What is it replaced with?

Explanation:

The Communist Party destroyed churches, mosques, and temples; it executed religious leaders; it flooded the schools and media with anti-religious propaganda; and it introduced a belief system called “scientific atheism,” complete with atheist rituals, proselytizers, and a promise of worldly salvation.

In the wake of the disintegration of the Soviet Union, the now independent states of the Russian Federation, Ukraine, and Belarus came together to create the Commonwealth of Independent States (CIS). With the exception of Georgia and the Baltic States, the former Soviet Republics joined the CIS by the end of the year.

I hope this helps.

the enslaved people onboard suffered from illness with some frequency

well that depends on how deep the hole is. you'd first go through te crust of the earth, then the upper mantle, then the lower mantle then the outer core, then the inner cor then you'd be stuck in the core to melt.