diff --git a/beta-pipelines/skylab/m3c/CondensedSnm3C.wdl b/beta-pipelines/skylab/m3c/CondensedSnm3C.wdl
index 232053de2f..5e9ecb80aa 100644
--- a/beta-pipelines/skylab/m3c/CondensedSnm3C.wdl
+++ b/beta-pipelines/skylab/m3c/CondensedSnm3C.wdl
@@ -7,6 +7,10 @@ workflow WDLized_snm3C {
         Array[File] fastq_input_read2
         File random_primer_indexes
         String plate_id
+        # mapping inputs
+        File tarred_index_files
+        File genome_fa
+        File chromosome_sizes
     }
 
     call Demultiplexing {
@@ -22,15 +26,18 @@ workflow WDLized_snm3C {
             tarred_demultiplexed_fastqs = Demultiplexing.tarred_demultiplexed_fastqs
     }
 
-   # call hisat_3n_pair_end_mapping_dna_mode {
-   #     input:
-   #         r1_trimmed = Sort_and_trim_r1_and_r2.r1_trimmed_fq,
-   #         r2_trimmed = Sort_and_trim_r1_and_r2.r2_trimmed_fq
-   # }
-#
+    call Hisat_3n_pair_end_mapping_dna_mode {
+        input:
+            r1_trimmed_tar = Sort_and_trim_r1_and_r2.r1_trimmed_fq_tar,
+            r2_trimmed_tar = Sort_and_trim_r1_and_r2.r2_trimmed_fq_tar,
+            tarred_index_files = tarred_index_files,
+            genome_fa = genome_fa,
+            chromosome_sizes = chromosome_sizes
+    }
+
    # call separate_unmapped_reads {
    #     input:
-   #         hisat3n_bam = hisat_3n_pair_end_mapping_dna_mode.hisat3n_bam
+   #         hisat3n_bam = Hisat_3n_pair_end_mapping_dna_mode.hisat3n_bam
    # }
 #
    # call split_unmapped_reads {
@@ -80,7 +87,7 @@ workflow WDLized_snm3C {
    # call summary {
    #     input:
    #         trimmed_stats = Sort_and_trim_r1_and_r2.trim_stats,
-   #         hisat3n_stats = hisat_3n_pair_end_mapping_dna_mode.hisat3n_stats,
+   #         hisat3n_stats = Hisat_3n_pair_end_mapping_dna_mode.hisat3n_stats,
    #         r1_hisat3n_stats = hisat_single_end_r1_r2_mapping_dna_mode_and_merge_sort_split_reads_by_name.r1_hisat3n_stats,
    #         r2_hisat3n_stats = hisat_single_end_r1_r2_mapping_dna_mode_and_merge_sort_split_reads_by_name.r2_hisat3n_stats,
    #         dedup_stats = dedup_unique_bam_and_index_unique_bam.dedup_stats,
@@ -97,9 +104,11 @@ workflow WDLized_snm3C {
         #File UniqueAlign_cell_parser_picard_dedup = dedup_unique_bam_and_index_unique_bam.dedup_stats
         #File SplitReads_cell_parser_hisat_summary = "?"
         #File hicFiles = call_chromatin_contacts.chromatin_contact_stats
-        File trimmed_stats = Sort_and_trim_r1_and_r2.trim_stats
-        File r1_trimmed_fq = Sort_and_trim_r1_and_r2.r1_trimmed_fq
-        File r2_trimmed_fq = Sort_and_trim_r1_and_r2.r2_trimmed_fq
+        File trimmed_stats = Sort_and_trim_r1_and_r2.trim_stats_tar
+        File r1_trimmed_fq = Sort_and_trim_r1_and_r2.r1_trimmed_fq_tar
+        File r2_trimmed_fq = Sort_and_trim_r1_and_r2.r2_trimmed_fq_tar
+        File hisat3n_stats_tar = Hisat_3n_pair_end_mapping_dna_mode.hisat3n_paired_end_stats_tar
+        File hisat3n_bam_tar = Hisat_3n_pair_end_mapping_dna_mode.hisat3n_paired_end_bam_tar
     }
 }
 
@@ -204,8 +213,8 @@ task Sort_and_trim_r1_and_r2 {
     for file in "${R1_files[@]}"; do
       sample_id=$(basename "$file" "-R1.fq.gz")
       r2_file="${sample_id}-R2.fq.gz"
-      gunzip -c "$file" | paste - - - - | sort -k1,1 -t " " | tr "\t" "\n" > "${sample_id}-R1_sorted.fq"
-      gunzip -c "$r2_file" | paste - - - - | sort -k1,1 -t " " | tr "\t" "\n" > "${sample_id}-R2_sorted.fq"
+      zcat "$file" | paste - - - - | sort -k1,1 -t " " | tr "\t" "\n" > "${sample_id}-R1_sorted.fq"
+      zcat "$r2_file" | paste - - - - | sort -k1,1 -t " " | tr "\t" "\n" > "${sample_id}-R2_sorted.fq"
     done
 
 
@@ -245,30 +254,91 @@ task Sort_and_trim_r1_and_r2 {
         memory: "${mem_size} GiB"
     }
     output {
-        File r1_trimmed_fq = "R1_trimmed_files.tar.gz"
-        File r2_trimmed_fq = "R2_trimmed_files.tar.gz"
-        File trim_stats = "trimmed_stats_files.tar.gz"
+        File r1_trimmed_fq_tar = "R1_trimmed_files.tar.gz"
+        File r2_trimmed_fq_tar = "R2_trimmed_files.tar.gz"
+        File trim_stats_tar = "trimmed_stats_files.tar.gz"
     }
 }
 
-#task hisat_3n_pair_end_mapping_dna_mode{
-#    input {
-#        File r1_trimmed
-#        File r2_trimmed
-#    }
-#    command <<<
-#    >>>
-#    runtime {
-#        docker: "fill_in"
-#        disks: "local-disk ${disk_size} HDD"
-#        cpu: 1
-#        memory: "${mem_size} GiB"
-#    }
-#    output {
-#        File hisat3n_bam = ""
-#        File hisat3n_stats = ""
-#    }
-#}
+task Hisat_3n_pair_end_mapping_dna_mode{
+    input {
+        File r1_trimmed_tar
+        File r2_trimmed_tar
+        File tarred_index_files
+        File genome_fa
+        File chromosome_sizes
+
+        String docker = "us.gcr.io/broad-gotc-prod/m3c-yap-hisat:1.0.0-2.2.1"
+        Int disk_size = 100
+        Int mem_size = 100
+    }
+    command <<<
+        set -euo pipefail
+
+        mkdir reference/
+        mkdir fastq/
+
+        cp ~{tarred_index_files} reference/
+        cp ~{genome_fa} reference/
+        cp ~{chromosome_sizes} reference/
+        cp ~{r1_trimmed_tar} fastq/
+        cp ~{r2_trimmed_tar} fastq/
+
+        # untar the index files
+        cd reference/
+        echo "Untarring the index files"
+        tar -zxvf ~{tarred_index_files}
+        rm ~{tarred_index_files}
+        samtools faidx hg38.fa
+
+        # untar the demultiplexed fastq files
+        cd ../fastq/
+        echo "Untarring the fastq files"
+        tar -zxvf ~{r1_trimmed_tar}
+        tar -zxvf ~{r2_trimmed_tar}
+        rm ~{r1_trimmed_tar}
+        rm ~{r2_trimmed_tar}
+
+        # define lists of r1 and r2 fq files
+        R1_files=($(ls | grep "\-R1_trimmed.fq.gz"))
+        R2_files=($(ls | grep "\-R2_trimmed.fq.gz"))
+
+        for file in "${R1_files[@]}"; do
+          sample_id=$(basename "$file" "-R1_trimmed.fq.gz")
+          hisat-3n /cromwell_root/reference/hg38 \
+          -q \
+          -1 ${sample_id}-R1_trimmed.fq.gz \
+          -2 ${sample_id}-R2_trimmed.fq.gz \
+          --directional-mapping-reverse \
+          --base-change C,T \
+          --no-repeat-index \
+          --no-spliced-alignment \
+          --no-temp-splicesite \
+          -t \
+          --new-summary \
+          --summary-file ${sample_id}.hisat3n_dna_summary.txt \
+          --threads 11 | samtools view -b -q 0 -o "${sample_id}.hisat3n_dna.unsort.bam"
+        done
+
+        # tar up the bam files and stats files
+        tar -zcvf hisat3n_paired_end_bam_files.tar.gz *.bam
+        tar -zcvf hisat3n_paired_end_stats_files.tar.gz *.hisat3n_dna_summary.txt
+
+        mv hisat3n_paired_end_bam_files.tar.gz ../
+        mv hisat3n_paired_end_stats_files.tar.gz ../
+
+    >>>
+    runtime {
+        docker: docker
+        disks: "local-disk ${disk_size} HDD"
+        cpu: 1
+        memory: "${mem_size} GiB"
+    }
+    output {
+        File hisat3n_paired_end_bam_tar = "hisat3n_paired_end_bam_files.tar.gz"
+        File hisat3n_paired_end_stats_tar = "hisat3n_paired_end_stats_files.tar.gz"
+    }
+}
 
 #task separate_unmapped_reads {
 #    input {