IWC Schaffhausen AQUATIMER DEEP TWO Operating Instructions Manual page 26

Functions of the crown
X
Normal position
This watch has a screw-in crown. Screwing the crown in to its normal pos-
ition (X) prevents the inadvertent adjustment of the time or date and also acts
as a double seal to prevent water from seeping into the case. To release the
crown, unscrew it by turning it to the left, where it automatically assumes
position 0, the winding position. By depressing the crown in position X and
turning it to the right at the same time, it is screwed down firmly again and
secured.
Important: Although the watch is water-resistant in positions 0, 1 and 2, the
crown should always be screwed in again for normal use (position X). The
crown must not be moved or used for any purpose whatsoever while under
water.
0 1 2
X Normal position (screwed in)
0 Winding position
1 Date setting
2 Time setting