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Observations placeholder

Being on a minesweeper



Type of Spiritual Experience


Number of hallucinations: 1


Minesweepers use infrasound to detect mines and there have been a number of reports that suggest that the use of infrasound affects the crew – the following scientific report is but one example of many


A description of the experience

[The psychological effect of minesweeping infrasonic field] - [Article in Chinese]; Huang ZQ, Liang ZF, Shi XF, Yu H.; Naval Medical Research Institute, Shanghai 200433, China.

OBJECTIVE:  To investigate the effect of infrasonic field of minesweeper on psychology of minesweeper crews.

METHODS:  An experimental ship was selected to conduct infrasonic minesweeping, a control ship of the same type was selected to operate likewise with the infrasound generator turned off, and another group of coast-servicemen was chosen as blank control. Attention-span test, digit memory test, two-digital numbers list and profile of mood states (POMS) were used to test the ship crews and coast-servicemen.

RESULTS:  There were no significant differences in psychological parameters between the two ship crews before the experiment. But the scores of two-digit figures list in ship crews were significant lower than that in coast-servicemen, (31.2 +/- 11.8, 36.4 +/- 14.5 respectively vs 45.8 +/- 13.9, P < 0.05). POMS showed that the scores of anger-hostility, fatigue-inertia, and confusion-bewilderment in both ship crew groups [(15.5 +/- 6.4, 18.3 +/- 6.8), (12.1 +/- 5.0,12.3 +/- 4.9), (11.6 +/- 4.4, 12.5 +/- 4.8), respectively] were higher than those in coast-servicemen (13.9 +/- 7.0, 7.6 +/- 4.1, 8.2 +/- 4.3, respectively, P < 0.05 or 0.01), while vigor-activity in experimental group (15.0 +/- 5.9) was lower than that in coast-servicemen (19.7 +/- 4.7). After the experiment, the scores of experimental crews in digit memory test (14.5 +/- 5.0), vigor-activity (12.2 +/- 5.8), fatigue-inertia (15.8 +/- 6.2) were significantly different from those of control crews (17.3 +/- 4.8, 16.5 +/- 4.6, 11.3 +/- 5.1).

CONCLUSIONS: The infrasonic field from minesweeper may injure the crew's psychological health and some neurobehavioral function. 

The source of the experience


Concepts, symbols and science items



Science Items

Activities and commonsteps



Vibroacoustic disease