This is today's edition of The Download, our weekday newsletter that provides a daily dose of what's going on in the world of technology.

Inexpensive seafloor-hopping submersibles could stoke deep-sea science—and mining

Last week, two oblong neon submersibles started to descend nearly 6,000 meters into the Pacific Ocean. Throughout the rest of May, they will map the seafloor in search of critical mineral deposits. 

If all goes well, the vehicles, built by Orpheus Ocean, could help scientists probe the vastly understudied deep sea—and the resources it holds—at a fraction of the cost of existing systems.

But the same submersibles are also attracting deep-sea mining companies, raising concerns about environmental impacts. Find out why they’re drawing so much attention.

—Hannah Richter

The new war room: 10 Things That Matter in AI Right Now 

A new kind of system has entered the war room: conversational AI tools that commanders turn to not just for analysis, but for advice. 

One US defense official told MIT Technology Review that personnel might give these advice engines a list of potential targets to help decide which to strike first. China is commissioning similar tools too.

But as the systems gain traction, they’re also sparking concerns about AI-generated errors, a lack of transparency, and Big Tech gaining undue influence over what information gets seen. 

Here’s how these AI advice engines could impact the battlefield.

—James O'Donnell

The new war room is one of the ...