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
Scuba Diving
In the Water

Top Five Things Movies Get Wrong About Scuba Diving

Hollywood has long been fascinated with scuba diving, but rarely nails the portrayal of our sport. Here are the top five things movies get wrong about scuba diving.

In the Water News

New Marine Parks Protect Enormous Part of Pacific

The nations of Niue and Chile combine to create vast marine protected areas in the Pacific

Sea Turtle Conservation
Conservation In the Water Marine Species

Sea Turtle Conservation Efforts Paying Off

In a rare bit of positive conservation news, sea turtle conservation efforts seem to be paying off.

fish mistake scent of plastic for food
Conservation In the Water

Fish Mistake Scent of Plastic for Food

Researchers have found that fish often mistake the scent of plastic for food, which means ingestion of this deadly material may not always be accidental. 

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