If you dropped into Shaw's Cove this week and thought the bottom looked... different - lower, rockier, more reef than you remembered - you're not losing your mind. The big south swell that ran through over Labor Day did what big swells do: it grabbed the sand and moved it. Here's what happened, why it happens, and what it means the next time you gear up.

If you dive the Marine Room regularly, you already know the drill. Some mornings you wade in off the sand and can see clear across the flats. Other mornings you put your face in the water and can barely see your own hand. Same beach, same short walk from the car, completely different day. I get asked all the time whether the brown water is runoff, the tide, or the swell. At the Marine Room it is almost always the swell, and once you understand how it works you can tell what y

Samba and LMC are the warning signs that come before a freediver passes out. How to recognize them, what they mean, and what every spearfisher and buddy needs to know.

Where to take a spearfishing class or safety course in San Diego — freediving and blackout-rescue training, plus online options to learn before you dive.

San Diego's surface could touch 74°F this week. Here's what that means locally — accelerating kelp rot, worsening blooms, murky warm shallows over cleaner cold water — and how to still get a good dive in.

Most dive accidents happen because the buddy team never had the conversation. The 5-minute pre-dive briefing template that makes the buddy system actually work — even with strangers and new dive partners.

Master the silent, efficient duck dive that keeps fish calm and saves your oxygen. Step-by-step mechanics, common mistakes, variations, and depth progression for California spearfishing.

Most freediving blackouts happen in the first 15-30 seconds after surfacing. How to do recovery breaths properly, why your buddy needs to watch you, and the protocol that prevents most surface blackouts.

The thermocline is where warm surface water meets cold deeper water - and where many predator species stage to feed. How to find it, what fish hold there, and how to hunt them.

Negative pressure dives let you train deep-water adaptation in a swimming pool. How they work, when to use them, and how to add them to your training without the depth risk.