Hello! There shouldn't be too many indoor swimming pools in Nanjing. Tickets for Wutaishan Swimming Pool are 35 yuan; National Fitness Center, Taicheng Swimming Pool, Military Sports Swimming Pool, Nanda Swimming Pool, Park Road Swimming Pool, Qinhuai Swimming Pool, etc. 1.75m and above are standard ponds with a water depth of 25m by 50m. I won't talk about those non-standard pools. Tickets generally range from 30 to 40 yuan. If you are interested in going there, I can tell you the details.