Could you give me a source for this?

Preferably a Finnish one. Not by language (although am Finnish so not an issue) but like a reliable source in Finland documenting that’s what they’re for?

I know we do have lots of infra designed “in case of Russian attack”, mainly the direction of roads on the eastern border, but I’d like to read up on this blowing bridges shit.

I’m not sure if this is something you’ll find an official source for as FDF isn’t known for openly sharing information regarding national defence.

However, you can find plenty of discussion for it online and for example on this video it’s mentioned around the 1:25 mark.

Yeah but I don’t see those hooks as being related. You don’t really need hooks like that to blow a bridge and that’s a small underpass of a regular road. You could cave that with a few sticks of TNT. And drilling them into the wall is much more efficient than hanging them off the wall.

I just suspect these hooks are just remnants of building it, and not for any specific purpose. Don’t really care if I’m wrong but I won’t be dissuaded unless someone actually proves it properly.

And drilling them into the wall is much more efficient than hanging them off the wall.

You cannot do this for a tactical retreat, which these kinds of slowing tactics require, they need to divert armored columns within minutes of the advances. I don’t have a source on if that’s what the hooks are specifically for, but I can think of nothing else that would aid a rapid demo more, that wouldn’t also be prone to problems.

Two soldiers with charges they taped or roped together ahead of time can throw them in line across the hooks in under a minute and get out. KISS.

they taped or roped together

Why not tape them to the bridge too?

I feel like driving out to the bridge would take longer than drilling a hole (with the benefit of maximizing destructive power).

Why not tape them to the bridge too?

Go get a baby. I guess something else that weighs similar would also work, but the awkwardness of a baby conveys the right level of fuss you would take with individual charges, and grab a roll of duct tape, then find a concrete wall of some kind and see how much tape you need to stick that baby to a rough old dirty concrete wall.

(Do not detonate the baby.)

The point is that you could do that, with a roll of gorilla tape.

The point isn’t it’s more awkward to do and takes longer, the point is that the explosive force delivered to the bridge would be the same. (Actually slightly more with a gorilla tape covered explosive as it would marginally increase the forces on the bridge compared to just hanging ones.)

If you put an explosive inside the bridge, the force delivered to the structure is several times more. Thus it would make sense to have “pits” to out explosives into, not just hooks to hang them off of.