Links

Diving in Southern California

Coastal Data Information Program: checking ocean conditions before  heading out is a must.

Marine Weather Forecast: rain is OK, wind not so much.

Beach Reports: storm drain or rivers run off can create a nasty mix in coastal waters... 

Forums

I am occasionally checking out the following forums, which contain a mixture of opinionated contributions and occasionally some worthwhile information on scuba and rebreather diving:

Rebreather World

CCR Explorers

Scubaboard

The Deco Stop

Cave Diver

Diving related websites

Cognitas Research: a good source of safety advice for divers.

Reading University BSAC: links to webinars and past conferences on different diving related topics. 

Literature

Rubicon Research Repository (a treasure trove of papers, reports and other publications on diving and dive medicine)

Diving and Hyperbaric Medicine Archives (available in open access 1 year after publication)

Tools

Gladius ROV: Deep diving is complex, dangerous and costly. These little Remotely Operated underwater Vehicles are a useful tool to have before jumping in the water on an unknown site... or replace diving altogether!