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Life & fun · January 28, 2026

Submerge

Good snorkelling and diving days don’t happen by accident

What it does

Submerge shows simple, site-specific dive and snorkel conditions for Western Australia so you know when visibility is worth the drive.

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    Submarius started as just a dashboard for diving conditions, but I quickly realized that there is simply no API for water clarity, nor even a simple way to calculate it. Divers call it viz, and it is one of the most consequential factors for a diving experience. So I dove the viz rabbit-hole. I landed on a state-augmented ensemble kalman filter. More details on the /clarity page. My question for the HN audience is if anyone knows of a better way of doing this? There is a ton of satellite data to train on, but a lot of it is messy (clouds read as turbid water, shallow reefs reflect…

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