Lesson Learned
RAF Henlow had one as I learned when I did my IOT there in 74. We all had to prove we could swim one length, Having swum at County level before joining, I took a racing dive into the pool and powered down to the end. My showing-off was seen by the PTI who told me to keep on back and forth until the entire sqn had attempted their one length. Lesson was rapidly learned as I climbed exhausted from the pool at the end.
FW