- 19 iv. holding facilities for aliens 32. As regards the establishments designated for detaining persons undergoing ordinary administrative removal procedures (i.e. for a maximum of three months), Amigdaleza Holding Centre, which was designated for women and minors, offered good material conditions. The premises were spacious, clean, had good lighting (including access to natural light) and ventilation, and were adequately albeit sparsely furnished. The situation at Hellenikon and Piraeus Holding Centres for Aliens8 was far less favourable; inmate accommodation was in a poor state of hygiene and devoid of furniture, artificial lighting was insufficient, and there were problems with the supply of water, particularly hot water. At Hellenikon, sleeping arrangements consisted of mattresses placed directly on the concrete floor. Further, the Piraeus centre was in need of repair, especially in the sanitary and shower areas. A feature common to all three holding centres was the total absence of organised activities. Further, inmates were not provided with newspapers, magazines or books, and could not watch television or listen to the radio. Admittedly, this state of forced idleness was mitigated to some extent by the open doors regime practised, and by generous visiting possibilities and access to telephones. However, minors held at the Amigdaleza centre were being offered no outdoor exercise; further, no outdoor exercise facilities were available at Piraeus and the exercise yard at Hellenikon was still not being used. These are particularly serious failings given the possible length of detention in those facilities. c. assessment 33. The CPT recognises that the demands placed on the Greek authorities are considerable, and wishes to acknowledge the efforts being made by those authorities to improve conditions in police detention facilities. Investment has been made to this end and additional - substantial - investment is foreseen; for example, the CPT has been informed that the longstanding plans to build a new police detention centre for Athens should be implemented by 2003. A particularly welcome development is the fact that recourse to detention under immigration rules has decreased, as has the length of custody in such cases9. 8 Cf. CPT/Inf (2001) 18, Part I, paragraphs 54 to 63 and Part II, paragraphs 29 and 30. 9 Law 2910, of 26 April 2001, on the entry and residence of aliens in Greek territory (cf. paragraph 10, third subparagraph), has permitted the regularisation of the situation of many foreigners who were previously in breach of immigration rules and has introduced a three-month limit on the detention of foreigners awaiting removal under administrative procedures.