(echoey, low pitched, & time-stretched)
(echoey, low pitched, & time-stretched)
(reverberant & time-stretched)
(echoey, low pitched, & time-stretched)
(echoey, low pitched, & time-stretched)
(echoey, low pitched, & time-stretched)
(echoey, low pitched, & time-stretched)
(echoey, low pitched, & time-stretched)
(echoey, low pitched, & time-stretched)
(echoey, low pitched, & time-stretched)
(echoey, low pitched, & time-stretched)
(multiple times; descending in pitch)