Guild Wars 2

I think I’ve accidently found an exit point for a Puzzle Complex, with a Chest Reward, but I can’t figure out how to get to it.

If one looks at the Vista Point between Twin Sisters and Behem Gauntlet, there is a Waterfall with an obvious Bridge on the second tier. Well, as it turns out, you can walk into the Waterfall, and there are slimes that drop interesting loot, and a Vetran Shark deeper in that lower cave area. However, there is this whole complex above the Shark Pool that I can’t figure out how to get to. I figure that I’m going the wrong way, but there doesn’t seem to be any other climbs inside the cave. I tried going the long way around to see if I just missed a cave entrance, but outside of a Spider Den (with a close quarter Veteran Spider Fight, Yikes!), I have not found any other enterances.

Does anyone else know about this? Can you help me figure out how to get up into that higher level above that Shark Tank? If you can, thank you very much!

I was in this area a couple of days ago. After the waterfall, oozes, I swam underwater. I saw the red name for the veteran shark, but never ran into it. Somehow during my swim I got mixed up and swam in circles trying to find any openings and ended coming to the surface in the complex. My map looked like a huge scribble.
Sorry I don’t have a better description of how to get into the complex. I couldn’t figure out how to get the chest. I’d love to know how to get to it.

In the spoiler is a description of the complex.
There were more oozes (that kept re-spawning) and a ledge that circled half of the area. The chest is on top of a stalagmite and I didn't have any success in figuring out how to get it.

The veteran spider cave is the entrance to that puzzle. It will put you at the top of the complex. The way you first got in is the failure exit if you miss your jump and end up in the pool. There’s no way back up (that I’ve found) after you hit the water, other than exiting and coming back through the spiders.

@Blacklight Thanks for the info!

Ooooooooooh. Yeah, I got into here today. It’s weird though, because there’s this whole other thing that doesn’t seem to go anywhere. If you go into the Shark Pool, and swim away from the exit, there is a small hole in the rocks, just big enough to swim through. This puts you in another wide underwater cave, and you can dive down a couple hundred feet, then across for a bit, and then up again, but from there there doesn’t seem to be any exits. That whole area is under water, but doesn’t seem to go anywhere, have any enemies, or have any prizes. Odd.