True, but a 10000 DWT cargo liner at the time had 5 holds/hatches, 3 decks and 20 cargo derricks and carried 12 Pax.
Each deck had wooden hatch boards and steel cross beams and the top hatch had to be battened down with 3 tarpaulins.
No airconditioned ECR and no remote readout of levels, pressures or temperatures.
Here is one I was onboard in 1960 and -61
The first trip was from Europe to Australia, where the “wharfies” did not touch anything other than the cargo.
The next two trip were to the Far East and the stevedores (coolies) did everything once in port. (Heaven)
PS> The crew still had to top up and rig the derricks on arrival and make the ship ready for sea though.
Yes some container ships has capacity >20K TEUs and a minimum safe manning of <20. (usual crewed by abt. 22-25 pers.)
But those ships are also without cargo gear (some even without hatch covers)
The E/R are semi-automated and UMS classed.
BTW; Container freight rates are sky high today, but “how long was Adam (and Eve) in Paradise??”
Besides; not all ships are carrying containers and enjoying a boom market. (But for how long??)