No process in rem in an action proved for in the Admiralty Supplemental Rules shall
be served, except on behalf of the United States, or on special order of the Court, unless the
party seeking the same shall deposit with the Marshal for this district such sums as may be
required by the Marshal as an advance against attachment and custodial costs. This rule
does not apply if seizure is effected pursuant to an order of Court appointing a custodian of
the property seized, in which case no deposit shall be required. Further, the party seizing
the property may be required by the Marshal, to give him a full release and agreement to
indemnify the Marshal for any liability which he may incur as a result of arresting the
vessel or other property.
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