Scuba Diver Australasia + Ocean Planet - - Buyer's Guide -

At 1 me­tre

The wa­ter pres­sure out­side of your eardrums is

10 per­cent greater than the pres­sure in your mid­dle ears. Your eardrums flex in­ward to com­pen­sate – you may feel some pres­sure

At 2 me­treS

The pres­sure dif­fer­en­tial is 20 per­cent greater than at the sur­face and your eardrums bulge fur­ther. You feel def­i­nite

pres­sure, and many be­gin to feel pain


2 me­treS

Your eardrums are stretched to their lim­its. Un­less you have equalised, you will feel sig­nif­i­cant dis­com­fort

or pain. The tis­sues and blood ves­sels in your ear may start to break, and as the pres­sure dif­fer­en­tial builds, your eu­stachian tubes will shut, mak­ing equal­i­sa­tion im­pos­si­ble

AT 3 me­treS

If your eardrums haven’t bro­ken yet, the pres­sure dif­fer­en­tial be­gins to draw blood and

fluid from the sur­round­ing tis­sues into your mid­dle ears, caus­ing mid­dle-ear

baro­trauma. Pain may be­come a feel­ing of full­ness which will re­main for a week or more


3 me­treS

If you haven’t equalised, your eardrum can

break and cause wa­ter to flood your mid­dle ears. The sud­den ex­po­sure can cause ver­tigo

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