Alert Diver Category: Dive Slate

At up to 330,000 pounds (149,685 kilograms) and 110 feet (33.5 meters) long, they are the largest creatures to have ever lived. 

Discover how Marc Kaiser developed his love for diving from childhood, influenced by early underwater shows and his father’s experiences.

This issue of Alert Diver marks the 10-year anniversary of the Winter 2009 redesign of the magazine as a coffee-table quarterly. The new Alert Diver also celebrates the scuba lifestyle with articles about dive travel, underwater photography, ecology and marine biological science. The magazine is also available as a free download for both Apple and Android devices via the Alert Diver app and as an online flipbook.

Considered critically endangered, smalltooth sawfish are under pressure from anglers who would take their rostrums as souvenirs and from the shark-fin trade. Many divers can go their whole lives without seeing one.

While helpful for humans, sunscreen is detrimental to corals and underwater environments.

Breast cancer can be debilitating and one DAN member shares her story of recovery and returning to diving after complex breast cancer surgery.

Underwater filmmaker Michele Hall has made over a dozen documentaries and has amassed well-deserved awards and accolades. Read more about Michele Hall and her work.

Sargassum plays a significant role in a healthy marine ecosystem in different ways, including providing shelter and fostering breeding opportunities. Read more about sargassum and its importance.

Waterlust is an online film series that blends water-related science, sport and art. Learn more about the film Waterlust and how water connects us all.

NASA has been conducting training missions at the Aquarius Reef Base underwater Habitat off Key Largo, Fla since 2001. NASA has staged many projects from Aquarius because the parallels of diving and space travel. Learn more about this NASA partnership.