Citizen Eco-Drive b740 Instruction Manual page 47

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The watch does not switch to the time mode from the depth indication.
When the user climbs to a high place or is on a flight, the watch may
unexpectedly be shifted to the dive mode because of a sharp change in the
atmospheric pressure (pressure change equivalent to the depth of 1 m/5 ft).
(The watch may enter the dive mode when the water sensor is activated by
sweat or other moisture.) If it occurs, the watch may fail to switch from the dive
mode after the user goes back to the ground level, because the depth meter
function didn't reset the depth indication to "0 m (0 ft)".
If the depth indication is less than 4 m (15 ft), press button (A) for 2 seconds or
more to switch to the time mode. If the depth indication is more than 4 m (15 ft),
adjust the watch according to "11. ALL RESET/ADJUSTING HAND POSITION".
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