Meanings

intruder

to quieten down

diving

to go underground

to hold one's breath

to make something pass through (esp. in cooking)

to hide

semi-submersible

Japanese forest rat snake (Euprepiophis conspicillatus, Elaphe conspicillata)

hideout (e.g. of fugitive from justice)

antisubmarine

saturation diving

submarine aircraft carrier

occult blood

underground Christian

fecal occult blood

incubation period

to lower one's voice

diving reflex

(professional) licensed diver