Figure 1.
Schematic representation. (A) A full-face diving mask with a 3D-printed adapter (green) and air filter (yellow); (B) A participant.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.