Underwater Survival (OSS)

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:One approaches the sea as one speaks to a jealous lover- carefully. For the sea is a cruel mistress: harsh, secretive, and utterly without mercy.
: -Ishmael, bard of Ghwyven-Rill
Many adventurers underestimate the dangers of underwater exploration. Traveling beneath the waves isn't like sneaking into the lair of an orc tribe. Rather, underwater explorers face an excursion into a completely foreign and hostile environment where the very elements of nature pose the greatest threat to survival.
This chapter presents rules that cover the basics of underwater survival-such as breathing, vision, hearing, and movement. In addition, several sections offer practical suggestions on how Dungeon Masters can apply these rules during play to enhance the experience of underwater adventuring.
* Breathing
** Types of Magical Breathing
*** Conversion
*** Transformation
*** Adaptation
* Vision
** Absorption
** Visual Distance Underwater
* Temperature
** Optional Rule: Freezing to Death
* Communication
** Hearing
** Speaking
*** Underwater Conversation
** Non-verbal Communication
*** Underwater Communication Proficiency
* Movement
** Swimming Underwater
*** Surfacing
*** Sinking
*** Maximum Depth
*** Swimming and Maneuverability
*** Swimming and Endurance
** Walking
* Dungeon Mastery Tips
** Vision
** Hearing