The “doorway to the deep,” he said, was open to everybody. Those who’d reached the doorway described it in quasireligious terms—transcendent, life-changing, purifying. A new and shimmering universe. Getting there didn’t require rupturing lungs or tearing a larynx. All you needed was a little training. All you needed was faith. All you needed was a certain level of comfort with voluntary asphyxiation.
