I'm thinking that inside the containers are(looking at a previous stills)flying bug/insect type creatures.When disturbed in one way or another hatch and primarily do the job of a face-hugger. The dead! humanoid/creature on the floor in one of the latest pictures could be that of a space jockey. So many options and opinions on what could be the roll of the jockeys etc. But The Master Ridley Scott rarely disappoints,I'm expecting good things from this,too much is at stake to mess up with,enjoy...