Instructor Manual
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Ocean Diver
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Adapting to the underwater world
Copyright © BSAC 2017
02
Module content
This module considers the effects of depth and pressure
underwater, basic equipment, scuba equipment,
buoyancy and thermal protection.
Understanding air and water pressure and the
physical effects on the diver in the underwater environment
Explain that before discussing diving equipment, students need to have some
understanding of the diving environment and its effects on divers and how
equipment, both snorkelling and scuba, is designed with this in mind. There will
also be an introduction to buoyancy control and heat loss. Finally explain how
divers can reduce heat loss through thermal protection options.
The module covers the following topics:
• The effects of depth and pressure
Divers need to have a basic understanding of the effects of depth and pressure
on their bodies and equipment while diving. This knowledge will be the
foundation of many of the topics introduced in future stages of their training and
is required to ensure safety.
• Snorkelling equipment
The sport of diving all starts with snorkelling equipment which allows us to see
underwater, swim efficiently and breathe air while swimming on the surface
face-down.
• Scuba equipment
Self-contained underwater breathing apparatus (Scuba) has allowed millions
of people to enjoy the underwater world. Ocean Divers need to know about
the key features and functions of this equipment to be able to dive in comfort
and safety.
• Buoyancy
A key skill for Ocean Divers to master is that of buoyancy control. A basic
knowledge of the principles which impact a diver’s buoyancy are important in
developing these skills.
• Thermal protection
Keeping warm is a key consideration when diving. Even in warm tropical waters
divers need to consider the impact of water temperature on their bodies.
