my heart cries under the water..
Yes, now prove me wrong.. :P
Why wouldn't it be?
Are you asking can your eyes expel tears underwater, or are you asking can you cry underwater?
Oh, yeah, crying is totally possible. If you're wearing a pressurized mask, your can also tear-up. But without a mask, at about 20', the pressure equalizes, and you won't produce tears. But trust me, if you hurt yourself, you can be at 300' and cry.
Read your question again.
Yes as long as you don't 'sob'