In a civil forfeiture proceeding in Admiralty, discovery sanctions are slightly more severe than in the civil analogue. The Court must weigh severity, repetition, and deliberateness of the violation must be considered. No prejudice need be shown. The court did not abuse its discretion in striking the late response and issuing default judgment against a vessel whose claimants asserted a Fifth Amendment exception to civil interrogatories, having previously asserted the exception in a motion to stay that was denied without prejudice. Although one of the claimants was being held in solitary confinement during the discovery period, the other claimant was not so encumbered.