"Olympic" sized swimming pools really only means that it is 50m long. Over the years the other dimenstions have changed. In times past, the outside lanes......1 and 8 had the side of the pool as a boundry. That has changed, due to the fact that the wave motion reflecting off the wall slows down the swimmers in those two lanes.....so they are wider now and have an extra lane outside Lane 1 and Lane 8. The depth has gotten deeper also for the same reason. The deeper the pool, the less the swimmers have to fight the reflected wave motion from the bottom of the pool.
In the 70's, my university built an "Olympic" sized pool for the use of the students. With the exception of the diving area, I can/could stand on the bottom anywhere in the pool. It was not made for inter-university competions.
Since it was fairly new, I dont doubt that the pool used in TAR 14 was over 7' deep. It was not the pool used for Olympic competion, but most assuredly was used for practice during the Olympics.