Full of Bilharzia- a minute water borne snail that gravitates through the skin and does something awful to you.
Yup, bad news indeed.
If the patient is not treated promptly (as I recall) it is curtins after awhile.
The inversion off of many airports in Africa and the middle east during certain times of the year can be quite an eye-operer, alright...for those that have not experienced same.
Also, when landing, if the approach is over a body of water just shortly off the end of the runway. the 'sinking effect' (in the transition from over the land) can be quite pronounced....especially with old straight-pipe engines.