IIRC maglocks around that size can hold like 1,200 lbs of force and there's two of them on that one portal. You'd destroy the door before they'd release. Somebody disabled them.
Literally like something out of a Bond movie.
Ground effect. Efficient, but problematic. Might be useful as drones, but would be suicidal to man them against defended targets. Very confined flight envelope. Slow (relative) to modern defenses and very lightly built for obvious reasons.
Might be an interesting personal ferry in calmer waters and weather, but outside of niche apps, there's a reason why they've never caught on despite a century of testing.
Hydrofoils are cool AF until they hit something in the water…which happens a lot more than people realize. Then it's not so much fun anymore as you torpedo into the water at nearly airplane speeds. Suckus maximus fatalis.
Imagine a semi going under a low bridge, upside down; without a road to keep the pitching moment from slamming the cab up into the overpass.
Depends on who hit what. Whales are big, hydrofoils are small. Shipping containers bob just below the surface famously causing grief. Now imagine a hydrofoil hitting a submerged container at full speed while up on foils. Not good.
Imagine instead of a surfer, it's a Navy vessel with a hundred men and the Achille's heel of hydrofoils becomes clear.
https://gcaptain.com/high-speed-hydrofoil-ferry-hits-whale-in-japan/