LEGO 6180 Hydro Search Sub is a Aquazone set from 1998 valued at $285 for new and sealed sets, up 471% from an original retail price of $49.99. Annual appreciation has averaged 5.86% since release. Used copies are valued between $117 and $171 depending on condition.
LEGO 6180 Hydro Search Sub is an Aquazone Hydronauts set released in 1998, containing 297 pieces and 4 minifigures. It builds a large Hydronauts submarine with a front cockpit, a rear prison cell/cargo bay, side bays for green storage containers, and a detachable scout sub mounted by magnets. The auxiliary sub features a green-domed cockpit, twin hoses with suction cups, dual harpoon guns, and removable searchlights that attach to helmets. The crew includes three Hydronauts and a captured Stingray minifigure, and the set is the largest Hydronauts submarine; it has also been referred to as Aquanaut Magnox in some materials.
A new and sealed Hydro Search Sub is currently valued at around $285, with annual growth of approximately 4%, which is lower than other Hydronauts sets. The average used price is $143 for those in good overall condition. New and sealed listings currently range from $275 to $437. Based on current trends, this set could be valued near $302 within the next year.