LEGO 6190 Shark's Crystal Cave is a vintage Aquazone set from 1996 valued at $500 for new and sealed sets, up 900% from an original retail price of $49.99. Annual appreciation has averaged 4.81% since release. Used copies are valued between $117 and $156 depending on condition.
LEGO 6190 Shark's Crystal Cave is an Aquazone Aquasharks set released in 1996, containing 258 pieces and 2 minifigures. The largest set in the Aquasharks subtheme, it features a substantial twin-cockpit sub with a crew cabin, multiple storage compartments, adjustable fins, propellers, a compass element, and translucent viewports; it was also marketed as Aquashark Sea Wolf. The underwater base area uses an exclusive blue crater baseplate with a raised platform on pipe-style columns and a working cage that can release a shark. Minifigures include Thresher, the Aquasharks leader, and one additional Aquashark.
A new and sealed Shark's Crystal Cave is currently valued at around $500, with annual growth of approximately 3%, which is lower than other Aquasharks sets. The average used price is $130 for those in good overall condition. New and sealed listings currently range from $382 to $546. Based on current trends, this set could be valued near $524 within the next year.