- 45 iii. Pavlos Melas Military Prison 123. This establishment possessed six cells, each equipped with three beds. Their respective sizes - varying from 19 to 23 m² - were quite sufficient for such an occupancy level; and the prison was operating well within its capacity at the time of the delegation's visit. The cells were impeccably clean and enjoyed good lighting (including access to natural light) and ventilation. 124. Prisoners were allowed to leave their cells during more than 12 hours a day. They had access to a day room/dining area, which was equipped with a television and table-tennis table, as well as to a large outdoor exercise area where games such as volley ball could be played. 125. To sum up, bearing in mind the relatively short period of time that most persons were held in the establishment (cf. paragraph 93), conditions of detention at Pavlos Melas Military Prison could be described as very satisfactory. However, it would be appropriate to offer a better range of activities - and in particular work - to any remand prisoner staying for a lengthy period at the prison. b. contact with the outside world 126. It is very important for prisoners to be able to maintain reasonably good contact with the outside world. Above all, a prisoner must be given the means of safeguarding his relationships with his family and close friends. The continuation of such relationships is of crucial importance for the social rehabilitation of a prisoner. The guiding principle should be the promotion of contact with the outside world; any limitations upon such contact should be based exclusively on security concerns of an appreciable nature or resource considerations. 127. According to the Code of basic rules for the treatment of prisoners (Rule 50), every prisoner is allowed at least one visit per week from a family member; and visits from other persons may be authorised. The delegation found that, in practice, the situation was more favourable; for example, at Korydallos Mens Prison, all prisoners were allowed three 25-minute visits per week. Prisoners are allowed to make telephone calls on a regular basis (at least once a week) and, save in exceptional cases, mail is not censored. Further, a system of prison leave exists, the terms of which have recently been made more favourable. To sum up, prisoners in Greece would appear to have sufficient possibilities for maintaining contact with the outside world. On the other hand, the facilities for making use of those possibilities - and in particular visiting areas - often left much to be desired.