Thomas Gronfeldt


Thomas started diving during college and has since been diving over most of the world: Australia, Indonesia, Iceland, France, and many other places. He is a NAUI instructor and a commercial diver, and participates in environmental and archeological diving projects around the world.

Stories by Thomas
Budget Dive Computers
Dive Computers In the Water

Budget Dive Computers For Any Need

Get all the features you need without breaking the bank with any of these budget dive computers

Plastic Bag Ban
Conservation In the Water News

Chile Introduces Plastic Bag Ban

Another country joins the list of nations that has instituted a plastic bag ban

Ocean Plastic
Conservation In the Water News

Most Ocean Plastic May Come From Only 10 Rivers

Researchers may have come one step closer to identifying the ocean-plastic supply chain, as it seems most ocean plastic may come from only 10 rivers

In the Water News

More Than 2,000 Sharks Die in San Francisco Bay

Scientists are trying to explain a massive die-off of leopard sharks, Pacific angel sharks, and brown smooth-hound sharks in the San Francisco Bay.

New stuff
Macro Images

Shooting for a Black or Blue Background in Macro Images

Once you’ve mastered lighting in your underwater compositions, it’s time to learn how to shoot for a black or blue background in your macro images.
by Guest Author
Drysuit P-Valve

Introduction to the Drysuit P-Valve

There are divers who pee in their wetsuits and divers who lie about it. But what if you’re in a drysuit when the urge strikes? A drysuit p-valve can save the day.
by Richard Devanney
undersea vegetarians

The Undersea Vegetarians of Wakatobi

Plant-based diets have gained a lot of popularity in recent years, but plenty of marine animals have always eaten this way. Meet the ahead-of-the-trend vegetarians of Wakatobi Dive Resort. 
by Guest Author
Lemon Shark

Diving the Lemon Shark Aggregation of Jupiter

From December to late March, the waters off Jupiter Florida are home to a spectacular lemon shark aggregation.
by Chris Vyvyan-Robinson