detention. It has also stated that unacknowledged detention is a complete negation of these guarantees and discloses a very grave violation of Article 5 (see {Cicek} v. Turkey, No. 25704/94, § 164, 27 February 2001, and Luluyev and Others, cited above, § 122).
129. The Court has found it established that Marvan Idalov was apprehended by State servicemen on 22 November 2002 and has not been seen since. His detention was not acknowledged, was not logged in any custody records and there exists no official trace of his subsequent whereabouts or fate. In accordance with the Court's practice, this fact in itself must be considered a most serious failing, since it enables those responsible for an act of deprivation of liberty to conceal their involvement in a crime, to cover their tracks and to escape accountability for the fate of a detainee. Furthermore, the absence of detention records, noting such matters as the date, time and location of detention and the name of the detainee as well as the reasons for the detention and the name of the person effecting it, must be seen as incompatible with the very purpose of Article 5 of the Convention (see Orhan, cited above, § 371).
130. In view of the foregoing, the Court finds that Marvan Idalov was held in unacknowledged detention without any of the safeguards contained in Article 5. This constitutes a particularly grave violation of the right to liberty and security enshrined in Article 5 of the Convention.
VIII. Alleged violation of Article 13 of the Convention
131. The applicants complained that they had been deprived of effective remedies in respect of the aforementioned violations, contrary to Article 13 of the Convention, which provides:
"Everyone whose rights and freedoms as set forth in [the] Convention are violated shall have an effective remedy before a national authority notwithstanding that the violation has been committed by persons acting in an official capacity."
A. The parties' submissions
132. The Government contended that the applicants had had effective remedies at their disposal as required by Article 13 of the Convention and had not been prevented from using them. The applicants had had an opportunity to challenge the actions or omissions of the investigating authorities in court pursuant to Article 125 of the Russian Code of Criminal Procedure or to bring civil claims for damages.
133. The applicants reiterated the complaint.
B. The Court's assessment
1. Admissibility
134. The Court notes that this complaint is not manifestly ill-founded within the meaning of Article 35 § 3 of the Convention. It further notes that it is not inadmissible on any other grounds. It must therefore be declared admissible.
2. Merits
135. The Court reiterates that Article 13 of the Convention guarantees the availability at national level of a remedy to enforce the substance of the Convention rights and freedoms in whatever form they might happen to be secured in the domestic legal order. According to the Court's settled case-law, the effect of Article 13 of the Convention is to require the provision of a remedy at national level allowing the competent domestic authority both to deal with the substance of a relevant Convention complaint and to grant appropriate relief, although Contracting States are afforded some discretion as to the manner in which they comply with their obligations under this provision. However, such a remedy is only required in respect of grievances which can be regarded as "arguable" in terms of the Convention (see, among many other authorities, Halford v. the United Kingdom, 25 June 1997, § 64, Reports of Judgments and Decisions 1997-III).
136. As regards the complaint of lack of effective remedies in respect of the
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