Plus: Elon Musk pushed OpenAI to go commercial, its president has testified. 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 .…