This t-shirt for scuba divers takes on the familiar March of Progress image originally published in 1965 to show the progression of 25 million years of human evolution. Typically, the illustration shows a primate walking on all fours progressing to an ape-like figure walking upright, and each subsequent image shows a figure that looks more and more like homo sapiens. 

In this case, the final two images in the progression depict scuba divers in silhouette form. The last image is of a scuba diver horizontal in the water, which is preceded by the silhouette of a diver performing a giant stride water entry. 

This all-white silhouette design looks great on a black tee, as shown here, or get this in a variety of different color options. This top can be purchased in a comfortable unisex cut as shown, or get a cut for women or youth.

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Celebrate St. Patrick's Day with this fun scuba themed holiday t-shirt. If you'd rather be diving on the Irish holiday, this novelty tee is for you. Bold white and dark green text reads One Lucky Scuba Diver in all caps. The slogan is accompanied by a lucky four leaf clover icon. The design looks great on a grass green shirt and the garment is perfect for wearing on and around St. Patrick's Day.

This shirt is available in cuts for youth, women, and unisex (shown). Get this comfortable cotton shirt for yourself or for your favorite Irish dive buddy.

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This adorable cartoon marine life design features a plump manatee with a baby. The image is accompanied by simple blue text that reads "save the manatees". This cute design is great for anyone who loves manatees! Wear this shirt at your next manatee festival, when you go see manatees in the wild, or any time you want to share love and awareness for these special aquatic animals.

Get this unique design on a unisex ringer shirt as shown, or pick from other apparel options and other novelty gift ideas. See some examples below.

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Here's a great last minute affordable Christmas gift idea for the scuba diver on your list -- this huge pack of highly rated scuba stickers is scheduled to arrive in plenty of time for Christmas at the time of this writing. 

With this purchase you'll get a pack of 40-50 vinyl stickers with a scuba diving theme.

You can give the pack of stickers as a gift on their own, or use the stickers to embellish fun gift items to give them a scuba theme! Think gifts like water bottles, hard computer or device cases, lunch boxes, scuba gear, and more! These stickers are great for personalizing rooms, laptop computers, bikes and kayaks, skateboards, helmets, and more.

Affordable gift idea: Check out your local dollar store to find "blank" gift ideas that can be "scuba themed" with the addition of one of these vinyl stickers. Ideas include: acrylic beverage glasses; coffee mugs; plastic or glass containers; vases; and phone cases.

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Dress up like the diver you are this holiday season with this cute "I'm the Diver Elf" design, available on long- and short-sleeve tees, raglan shirts and tank tops. The featured product here is a unisex sweatshirt, available in black as shown, or Navy Blue, Royal Blue, or Dark Heather Gray.

This cute mashup uses cute elf-like icons to frame fun and festive text. A curled elf cap with golden poms tops the design. Red and white striped stockings inside curly green elf shoes are found at the bottom.

Spread festive cheer and share the passion for your scuba diving hobby (or profession) with this cute Christmas sweatshirt for divers.