What are the dangers of swimming in natural waters?
What are the dangers of swimming in natural bodies of water? In essence I would like to know about all types of waters, but I am mostly interested in sea because it is most relevant to me. Like many people I enjoy taking a swim when at the sea side, and like many people I find that the stronger and bigger the waves the better. But then all the bad sea stories you've heard come back and it's really annoying, because what you constantly hear (at least when you're younger) is not how the sea works, but instead you hear threats and shallow warnings like 'if you swim too far off, the sea might pull you in'. The problem is I (and many other people I know) simply don't know anything about how the sea behaves.
Maybe you're aware of some bodies of work for lifeguards or something similar that might shine some light on the matter?
Note: The sea side I visit most often is Baltic Sea's south-eastern shore (Lithuania).
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This is highly dependent on the type of water as well as the location, but I'll summarise a few things to be aware of. In many locations most of these dangers won't factor in, but they're useful things to bear in mind if you're trying to assess the danger of a particular body of water. I'll focus on the sea here - for other things such as rivers similar things apply (but there's obviously other things to look out for, different kinds of wildlife, waterfalls, etc.)
Currents: Yes, there are areas of sea that can "pull you in". (The same obviously applies for rivers here, but this is less commonly thought of with the sea.) More dangerously, there are also currents that can "pull you under". Similarly, and sometimes just as dangerously, there are areas of the sea that can "pull you along" the coast horizontally. This can sometimes be dangerous simply because it's much easier to miss, and can pull you into dangerous areas such as:
River outflows: Along the same guise as currents, but these can often hide at full tide and seem to appear very suddenly and strongly if you move into them.
Quicksand: Not often thought of when you're in the water, but if you decide to stay on the bottom for a while and hit a patch of this, it can root you to the spot.
Watercraft: Again, something that's often missed, but stray jetskis (for example) can seriously injure or kill you if they hit you full on.
Hidden depth: While you can often expect beaches to fall down at a gentle angle, there are often hidden areas that can suddenly drop away. While not an inherent problem if you're a good swimmer, these can often be associated with undercurrents too - so beware. Personally I'll only swim on beaches I'm familiar with at high tide (and have seen at low tide) to try and mitigate this somewhat.
Wildlife: This varies greatly - some areas can have deadly sharks (or similar) in them, and these risks go without saying! However, bear in mind more common things such as jellyfish (some of which will just give you a nasty sting and others that can be lethal) and crabs (which will give you a nasty nip if feeling threatened.) Know what lives in the waters you're swimming in, and be prepared accordingly.
Sharp rocks: This goes hand in hand with wildlife in that sharp limpets can also live on rocks, making matters worse - but just because the entrance into the water looks sandy, doesn't mean it is all the way through. If you swim at high tide and stay in while the sea recedes, you may find yourself painfully clamouring over all types of nasties. Same goes if an unexpected large wave throws you against such rocks.
Pollution: Like any body of water, you should be aware of pollution - especially after storms many runoffs will quickly head into the sea containing a variety of toxins and bacteria. In some countries / areas factories are still permitted to dump waste into the sea directly, in this case I wouldn't even risk getting in the water!
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I have a couple of extra points that were always relevant for us as kids growing up in an extremely tidal area (peaking at 16knots - 30mph!):
Between islands, tidal races are usually predictable, and the local tide chart will let you know when slack tide (either high or low) is - these will be relatively safe times to swim. Halfway between these times the tide is at its maximum - which could sweep you rapidly away from your starting point.
Where there is a good surfing beach, you will find areas where the breakers do not come in - these are where the water brought in by the waves heads back out to see again. These can be very powerful and pull you down as well as straight out to sea rapidly.
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Adding one more, from my own experience: a "false floor". I stepped into a lake fully dressed with shorts and sandals, because I saw it was just 10 cm deep. Unfortunately, what I observed as being the floor of the lake, was in fact the upper layer of plant growth... and the lake was, at this shore, in fact more than 1 metre deep (but shallow enough to stand). I got quite the surprise and learned my lesson.
I've been told this happens particularly at lakes with swampy shores.
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I also would like to add: plants or sea 'wire' (hope that this is English). They tend to grow along the river banks and if your feet get strangled into it, it might be difficult to get your feet out of it, especially when the river flows.
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