Digging "beneath" water?

So I built a docking area, complete with boathouse (no roof unfortunately, because the SI in this game makes it bloody impossible if I want a longship to fit in there), and I built a perimeter fence around it to prevent spawns from wandering it, and/or getting in during events.

That being said, I can only extend the fence out so far into the water reasonable, before it hinder the potential movements of the boats in and out of said docking area. And I know mobs can both swim (some of them anyway) and move around fences if their pathfinding finds a way.

So, how can I lower the ground under the water further to ensure that this doesn't happen (pickaxe only reaches so far down before you start swimming)...or alternatively prevent spawns from trying to swim around the fence?
11:13 pm, June 1, 2021
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Ptolemy replied to Digging "beneath" water? June 2, 2021 @ 4:13:17 am PDT

Originally posted by Cockpuncher:
Originally posted by Ptolemy:

Leveling the ground doesn't affect the spawn of critters.
It works if done properly. That means not a single patch of grass left (a single grass can spawn a pack of lox). Thanks to this method my plains base is 100% peaceful.

The game's random spawn mechanics don't care whether the terrain has been altered. If no spawn is occuring around your base it's because of the structures there. Certain structures block the spawn (full list is here: https://valheim.fandom.com/wiki/Player_base ).
5:13 pm, June 2, 2021
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jonnin replied to Digging "beneath" water? June 2, 2021 @ 4:33:45 am PDT

you can make a U shaped terrain wall UP and far enough OUT that swimming in is highly discouraged. Once in a while something gets in, but they really have to work at it. The terrain is sloped so the boat floats normally, barely, but I can walk on it when the waves roll out if I need to recover nails etc. It supports the longship, just happen to have the karve today. Its in progress, this is the 'basement' and boating area of a planned home on top of it (the floor tiles behind me are where the home will go)

https://steamcommunity.com/sharedfiles/filedetails/?id=2505240586

https://steamcommunity.com/sharedfiles/filedetails/?id=2505240926
5:13 pm, June 2, 2021
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Cockpuncher replied to Digging "beneath" water? June 2, 2021 @ 5:27:46 am PDT

Originally posted by Ptolemy:
Originally posted by Cockpuncher:
It works if done properly. That means not a single patch of grass left (a single grass can spawn a pack of lox). Thanks to this method my plains base is 100% peaceful.

The game's random spawn mechanics don't care whether the terrain has been altered. If no spawn is occuring around your base it's because of the structures there. Certain structures block the spawn (full list is here: https://valheim.fandom.com/wiki/Player_base ).

There are no structures from the list at my base perimeter and I have no spawns on levelled ground. Tested this for hours and I know what I've seen. Got my base surrounded with levelled area. Enemies spawn, but just beyond levelled ground. At the edge of levelled terrain there is a palisade, which prevents them from coming closer, agro on player and attack the palisade.

Also I'm pretty sure that a single patch of unlevelled ground can spawn a lot of enemies. So it works only if done properly.

This works for regular spawns, not sure about the events, but so far enemies during events seemed to spawn beyond levelled ground.
5:13 pm, June 2, 2021
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luponix replied to Digging "beneath" water? June 2, 2021 @ 2:31:27 am PDT

you can build and dig underwater as much as you want if you add roof panes to keep you near the ground, take a look at this for how it works : https://www.reddit.com/r/valheim/comments/mcdrey/building_underwater/
11:13 am, June 2, 2021
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Cockpuncher replied to Digging "beneath" water? June 2, 2021 @ 2:36:57 am PDT

Are you aware that you can prevent spawning enemies on the shore by leveling the ground with your hoe? Just level enough outside your base, so nobody will spawn and swim to your base. You can plant grass after leveling, so the area doesn't look ugly like WWI no-mans land.
11:13 am, June 2, 2021
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Ptolemy replied to Digging "beneath" water? June 2, 2021 @ 2:41:38 am PDT

Originally posted by Cockpuncher:
Are you aware that you can prevent spawning enemies on the shore by leveling the ground with your hoe? Just level enough outside your base, so nobody will spawn and swim to your base. You can plant grass after leveling, so the area doesn't look ugly like WWI no-mans land.

Leveling the ground doesn't affect the spawn of critters.
11:13 am, June 2, 2021
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Athos42 replied to Digging "beneath" water? June 2, 2021 @ 2:54:16 am PDT

Yes, building a proper dock is a pest. Not only you put your hammer away as soon as your chest gets wet, you also have no free camera to properly to align the building parts. Because of these two points you cannot build walls from the sea floor up. Swimming is wonky... you can swim at the bottom of stairs and drown because you can't swim onto the first step. There are no gates that come in ship sizes. And the AI is cheating you because monsters don't use stamina. So even if your moat was two miles long, they still would swim around to attack your boat docked on the other side. And what good is a moat if the large waves on storms right pass THROUGH it? You simply cannot build quiet protected harbors surrounded by proper sea walls, moats and access gates.
11:13 am, June 2, 2021
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Cockpuncher replied to Digging "beneath" water? June 2, 2021 @ 3:39:28 am PDT

Originally posted by Ptolemy:
Originally posted by Cockpuncher:
Are you aware that you can prevent spawning enemies on the shore by leveling the ground with your hoe? Just level enough outside your base, so nobody will spawn and swim to your base. You can plant grass after leveling, so the area doesn't look ugly like WWI no-mans land.

Leveling the ground doesn't affect the spawn of critters.
It works if done properly. That means not a single patch of grass left (a single grass can spawn a pack of lox). Thanks to this method my plains base is 100% peaceful.
11:13 am, June 2, 2021
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Manwith Noname replied to Digging "beneath" water? June 1, 2021 @ 6:24:16 pm PDT

Originally posted by Liam_Monaghan:
I don't think it's possible, best you can do is pickaxe the ground untill you float

^^ This...unless you use the dev mode or mods.

I'm also convinced all the AI creatures and mobs don't have stamina. If you aggro them from the shore in a boat, they'll follow you endlessly* if you don't speed off.

*Endlessly is used here to express the fact I've seen mobs / creatuers swim great distances behind me and still attack the boat. I haven't actually tested how far they will go but I'm reasonably confident they will never drown or otherwise be impeded by the fact they are swimming.
2:13 am, June 2, 2021
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Lenny Rat replied to Digging "beneath" water? June 1, 2021 @ 6:39:46 pm PDT

As long as you have built a proper wall/moat around your area, 99% won’t path around them.

For the few that might (skellys and Draghr cannot drown and deep water does not deter them), you don’t have to worry. The only time they will come is during an “event” and they will go away as soon as it ends. They cannot climb onto your dock unless you have steps (which I always do). As long as you place a door on the steps, they cannot get in.
2:13 am, June 2, 2021
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Liam_Monaghan replied to Digging "beneath" water? June 1, 2021 @ 3:17:34 pm PDT

I don't think it's possible, best you can do is pickaxe the ground untill you float
11:13 pm, June 1, 2021
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Sabaithal replied to Digging "beneath" water? June 1, 2021 @ 3:19:12 pm PDT

Something needs to be done about this, either on the player end or development. Not much point in putting up a wall around a coastal base if mobs will just try and swim around it (especially if its long, in which case the mobs will just get stuck continuously.).
11:13 pm, June 1, 2021
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Ryzilynt replied to Digging "beneath" water? June 1, 2021 @ 3:25:23 pm PDT

People talk about using angle roof pieces to get under the water and walk on the bottom. Apparently when your feet hit the bottom to can use tools etc, no stamina drain or drowning.

Never tried it
11:13 pm, June 1, 2021
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Ryzilynt replied to Digging "beneath" water? June 1, 2021 @ 3:26:07 pm PDT

Also , just put your boat back in it’s box when you are done using it and it’ll be ok.
11:13 pm, June 1, 2021
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FunnyBunny replied to Digging "beneath" water? June 1, 2021 @ 3:38:01 pm PDT

You can prevent spawns by extending your player base area out far enough:

https://valheim.fandom.com/wiki/Player_base

Mobs will attack the above mentioned structures on sight, so you can use that to your advantage and make baits outside of your wall to draw them away from your water inlet.
11:13 pm, June 1, 2021
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warrenchmobile replied to Digging "beneath" water? June 1, 2021 @ 4:00:56 pm PDT

Build a mole or jetty by raising the ground out a few meters in a straight line, then extend your wall or palisade on top of that. Strong swimmers may get around it but it will take them some time. You can snipe them while they make the attempt.

I do note that if you build stone walls to the waters edge, those ground shaking trolls prefer to wade around the end of the wall rather than break through it.
11:13 pm, June 1, 2021
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