Or three per. Use a triangular spreader/yoke to keep them from having to pull laterally against (away from) each other. Single pivot point in the middle from which the load is suspended, allowing for imperfect coordination during hovering & movement. (The spreader can tilt or rotate.) Let a crawler crane and crew on the bank handle stacking/arrangement. Each container is lifted a second time into its temporary desert resting place. Has never been done before, just like space flight once. Would cost a lot and be dangerous, just like the military-industrial complex. Won't go perfectly, just like everything ever. Is inefficient, similar to but less so than losing the Suez Canal. Would take a long time, so start now. Really want to sarcastically thank all the naysayers and downvoters for policing all the dangerous creativity going on in this helicopter subthread. We must be more careful, especially considering how closely the shipping industry watches the Hacker News comments for ideas!
Yeah, i don't belive two pwe container is nearly enough. 3 or even 5 is a better idea smh, but you likely need 3 or 5 exceptionnal pilot who don't care if they die for science (and internationnal commerce).