Have you ever come across something underwater so strange that you had to snap a photo? Maybe like underwater photographer Jennifer Penner spotting a boombox sitting in a shipwreck (above), or a fishing pole with a fish still attached (it's happened), or a marine creature displaying a wacky behavior.

Submit your photos by using the hashtag #SportDiverGiveaway on Instagram or sharing them with us on Facebook. In order for our panel of judges to see your hash-tagged photo, your Instagram profile must be set to public. We'll pick our favorites and feature them in a photo gallery on SportDiver.com, and the three best will receive a prize grab bag from Prawno Apparel. This lifestyle clothing brand creates clothing inspired by the underwater photography of Lia Barrett. Prawno also has a focus on marine conservation, as its apparel incorporates materials made from post-consumer plastic bottles and recycled fabrics.

Please see Official Rules before entering.