Blue light beam in deep waters - what to do with it?

[RyF The GameReaveR]

In all maps (I think) there is thin light beacon far off shores.
If you get close, it disappears - a bit like the treasures in tLoZ - the Wind Waker.
Getting to the position of the beam, a structure can be seen under water - some sort of fish looking up, with blue particles coming out of its sky reaching gapping mouth.

I can't find a way to interact with it, as it's underwater. I tried a few things axcept anchoring right above it, but to no avail.

Does anyone know what to do?

[Saadiya]

I'm going to guess you unlock diving or get nets in a later chapter or something... either that or it's just something to make us ask "why".

[Lord Mango Esq]

Been wondering this myself. Anyone tried a slingshot into it?

[RyF The GameReaveR]

I've returned to one right now (new game) - i'll try a bunch of things. In the end it's a nautilus shell (more logical than my first description :D ) on a rock column.
https://steamuserimages-a.akamaihd.net/ugc/1599296008064735160/6E355585F6941A69BBB03515F163C18AB218BCA9/

[Alila]

I saw two of those particle streams last night, and yes they disappeared when I got within a few feet of it as well. I didn't see anything under the water, nor did I have anything to try to interact with it. I was also reminded of the underwater chests in Wind Waker, and thought maybe it was something that could be unlocked in a later chapter. I finished the game last night and didn't see anything obvious for it. I'm doing a survival playthrough now, and will try tossing rocks/arrows if I see one.

[Ashar]

when you go through a gate, or die(havnt died yet) you can buy a boon that allows you to dive underwater, its probably that.

[armageddon]

I saw a weird yellow beam of light and when I row to it it disappears as well. But I think that happens with every end checkpoint.

[Alila]

@Ashar, thanks for the tip, I'll keep an eye out for that. I just found a particle stream a little while ago and jumped out of the boat to investigate. I forgot about stamina/hunger as I was swimming round though and drowned trying to get back to the boat. xD

[RyF The GameReaveR]

Oh! Thanks Ashar - never was offered that boon.
I guess it'll give a bit of shards in the end - but I'll try to do it anyway :D

[Baelas]

I obtained the blessing and visited one of these. It gave me a prompt: "Sea Shards [E]" but I wasn't able to get anything useful. Just tapping E made Kara dive and fetch 0 shards and holding E does nothing.
Edit: Diving is repeatable, so my guess is that there is a set amount of sea shards to be had from the pillar, but that I am using the wrong method of gathering it.

[RyF The GameReaveR]

I figured a bit of the trick behind shards & the diving blessing - actually, if you buy and use the "one more blessing slot", you unlock the possibility to buy on the next transition some blessings that occupy 2 slots!
That's how I finally got the underwater diving ability. this blessing costs 1000 shards.

Diving at the blue light beam/ nautilus statue, I also got the 0 shards feedback like you did Baelas for each dive I did (many - almost until I had no stamina left - bearly made it back to my boat :D )- but in the end, I think i got an additionnal slot in my "blue" tool bar! I kept a copy of the savefile just before diving, so I'll be able to try again to confirm.