>> reporter: anacon doesn't usually lock his basement door.thinks it was probably slightly ajar and the big bear pushed it aside. this is the only door he comes down occasionally to check heating control levels. animal control officers believe the bear had been living here at least several weeks. an uninvited guest who had fashioned a little home for himself bringing in twigs and leaves and digging a bear-shaped layer, presumably, to keep him safe and warm all winter long. >> what chance would i have a 500-pound hungry bear? i could have ended up lunch! >> reporter: luckily that, didn't happen. the bear was caught, tagged, and released back on to state property, but anacon went out today and bought a lock for his basement door. i'm kathryn brown for cbs news. >> i think a lock is a good idea. >>> you have heard of swimming with the fishes. how about swimming and leaping like a dolphin? check this out. this is a french jet ski racer known as aquaman. what he has created is a device. it's like a jet pack for water that lets you dive, swim, and j

. >> reporter: 85-year-old frank anacon considers his den quite cozy but never imagined it would be ar's den. >> could have been lunch for 235 that big guy. >> reporter: he learned about his 550-pound roommate from the cable guy. >> like like what is that noise jo he turned around and saw this enormous black bear waking up in the corner. >> i freaked out and grabbed my tools and ran out of the basement. >> animal control officers came in to tranquilized the bear but he took off leading them on an hour-long chase. >> that's a big boy! >> reporter: seen video of it for the first time, anacon can't believe his eyes. >> look at the size of that! and he was down there dozing in my basement! >> reporter: ana con doesn't usually lock his basement door. he thinks it was probably slightly ajar and the big bear pushed it aside. this is the only door he comes down to check heating control levels. an uninvited guest who had fashion add little home for himself bringing in twigs and leaves and digging a bear-shaped layer, presumably, to keep him safe and warm all winter long. >> what chance would i