A photo which was sent to me by Jane Holton (Now Cawson) of the school in (I think) 1959 or 60ish.  She's sitting far right, but if I'm in there, I've no idea where.

Also of the tortoise in c. 1995, with my son (now in the Army and quite a bit bigger)

Re: tunnels by the river; my family lived at Spring Vale, which was a short way up the river from the school (past the prison).  The soil on the riverbank was very sandy and friable, which made it very easy to dig tunnels, and also unfortunately very easy to collapse...  On one occasion my brother John and I dug one which was luckily near the surface; it collapsed and I had a scary minute getting out.  There were lots of cape gooseberry bushes around there (physalis) which made for a pleasant afternoon otherwise.

This is well worth a read for those who lived in Moshi during the past half-century.  KCMC had changed significantly from earlier times, but Dr Pomfret's, and similar figures' input have ensured that its work continues.  From the title description: a series of thirty emails sent to family, friends and colleagues between 1996-2000. It depicts the adventures and life of the author and his wife, in their mid fifties, who left the comfort and security of their privileged Boston lifestyle to serve in Tanzania. The story depicts the beauty and one of Africa's most peaceful and beautiful nations and the sharing of language, culture, and lifestyle of its gracious people. It shares in the sadness of the HIV-AIDS pandemic, poverty, the founding of the country's second medical school, and our own misgivings of acquiring the skills of a new language, vocation and culture at that stage in our lives. It also shares the authors personal view of himself and the fulfilling nature of the work and faculty of Kilimanjaro Christian Medical Centre. In short, it is a brief journal of our adventures and love affair with one of the world's most beautiful country and people despite the significant handicap of poverty and rampant disease.
I was lucky enough to be treated by Dr Pomfret in the 90s following a heart attack, and his expertise and professionalism kept me going.

http://bookstore.trafford.com/Products/SKU-000137562/Dispatches-from-Kilimanjaro.aspx
https://www.amazon.com/Dispatches-Kilimanjaro-David-B-Pomfret/dp/1425106102

I was born at the German Mission near Njombe (Uwemba) in 1952, so I assume that it was the local centre of excellence in these matters!  Their website is at http://www.peramiho.org/en/abbey/uwemba.html
My parents were living in Njombe at the time (John and Dorothy Carlin).