In general, feeling a little bit tired after scuba diving is quite normal so long as you've followed safe dive practices. You could have got a bit cold during the dive, or it might just be because of the physical exertion you've made. Typically you need to get warm, rehydrate and refuel and you'll be fine.

What are the side effects of scuba diving?

Diving does entail some risk. Not to frighten you, but these risks include decompression sickness (DCS, the “bends”), arterial air embolism, and of course drowning. There are also effects of diving, such as nitrogen narcosis, that can contribute to the cause of these problems.

How does scuba diving make you feel?

Scuba diving allows you to let go of any busy thoughts in your head. It calms you down. Once you jump into the water you're able to escape from reality, because what you will feel under the sea will make you think that you're in another world where trouble and doubts don't exist.