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Technically Speaking – Talks on Technical Diving Volume 1: Genesis and Exodus

Technically Speaking, by Simon Pridmore
Technically Speaking, a new book by Simon Pridmore

Technically Speaking is the latest book from best-selling Scuba series author Simon Pridmore. It is a selection of themed talks telling the early history of technical diving—where it came from, how it developed, how it expanded across the world, who the important movers were and how, in the decade from 1989 to 1999, the efforts of a few determined people changed scuba diving forever.

(stock photo) Not that close please. Drone flights should be kept above 30 m where they are unlikely to provoke disturbance among cetaceans.

Whales are bothered by drones getting too close

Drone footage of marine mammals helps us better understand their behaviour and social structure or simply provides us with some stunning footage we couldn't obtain otherwise. However, drones can also affect whales, dolphins and other mammals if flown too close.

So what is too close and what are safe distances?

White sharks shed genetic material (skin and feces) into their environment which can be traced in water samples.
White sharks shed genetic material (skin and feces) into their environment which can be traced in water samples.

Tracing Mediterranean Great White Sharks With DNA

As fans of crime series will know, every living creature sheds DNA through skin cells, hair, scales and other bodily secretions as they move. This leaves behind a trace in whatever environment they were in, thus becoming environmental DNA (eDNA).

An emerging molecular technique called eDNA analysis enables researchers to scan samples of water, air, or soil for tiny remnants of DNA and identify organisms it came from.