OK. This is super interesting. I have a Nether Portal Hub. I knew the coordinates of my target location so I divided it by 8 and started digging. I miscalculated and instead of 300 blocks, I went 400. In the overworld, that would be 800 blocks from where I wanted to be! It put me in the middle of the ocean, in a cave, and I think under an Ocean Monument! At least, I was attacked by a Guardian (it looked large and gray but Elder Guardians outside of the Monument?) I've already got a portal here, might as well do something with it but that is a future project.
By the way, the portal is at level 13!
The questions I have are: Do you think I should try to get to the Monument from below? How far up do you think I would have to swim? Is there a limit to how deep the ocean can be? I have the items needed to make a Conduit but not the Prismarine to give it power.
You could definitely enter the portal from below, but only if you can rid yourself of the Mining Fatigue (got milk on hand?). In some ways, this is probably safer because you aren't exposed to the open waters where the swarms of guardians can attack and kill you. The monument can help protect you in this fashion. Most deep oceans cap around y:35 (just an estimate, it's about 30 blocks below sea level), but if you happen to catch an ocean ravine, well, that can go all the way down to diamond level. This means that monuments (which only spawn in deep oceans) will have a floor around this, between y:35-40. So, you're fairly close.
Bring milk and water breathing potions, and some Depth Strider boots - you should be good.
P.S. it's definitely possible to see elder guardians outside the monument. Unfortunately, that makes them more difficult to kill.
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If you don't have handy milk or don't want to fill inventory on that many buckets, you can use TNT to blast your way in. You'll have to keep your powder dry, though, or you won't be doing any damage to the walls.
The elder guardian wouldn't actually have been outside the monument, that's just the vision you get when it gives you Mining Fatigue, which it can do from up to 50 blocks away no matter how many solid blocks are inbetween.
Once you get inside the monument you can use the prismarine of the monument itself to power the conduit.
Bring an instaminable block, TNT/slimeblock/probably honeyblock, place that block one block diagonally in from a corner of a water filled room with smooth walls, ceiling and floor next to that corner, place the conduit on it and remove the block and the conduit should start up.
I usually bring lots of doors and trapdoors to block off rooms (with cobblestone above and on the sides as needed.) and instaminable blocks to get rid of the water.
Nowdays, with conduits, getting rid of the water isn't as important but it's nice to have a water free room with doors to keep the guardians out as a safe base.
I find that if I empty the water out of a room, have a conduit and an Efficiency pick I can knock a hole in a wall even with Mining Fatigue, it's not fast but fast enough for a few holes (I'm horrible at finding my way in mazes and stuff so I like to be able to make a shortcut).